Frigid days and thirsty birds

Before my next Yellowstone blog (later today; I’m on a roll after a long posting absence), I wanted to share a tip with those of you concerned about birds when you’re confronted with frigid temperatures.

Here in the Southeastern USA, our late autumn/winter season has so far been a temperature roller coaster. We have gone from afternoon temperatures in the 50s and 60s F° (about 10-15 C°) to morning lows of 10 to 25 F° (-12 to -3 C°).

Carolina chickadee

My porch features some shallow plastic plant saucers that I keep filled with water and a solar fountain. The smaller birds especially like to get drinks there because it is more sheltered than the bird baths out in the yard. However, that water has been frozen and birds began chipping at it fruitlessly to get a drink.

Northern cardinal

As a hiker, I often use hand, toe and body warmers when I walk in the cold. So it occurred to me that I might use them to provide the birds with some liquid refreshment in the cold. Wikipedia explains what they are: “Air-activated hand warmers contain cellulose, iron, activated carbon, vermiculite (which holds water) and salt and produce heat from the exothermic oxidation of iron when exposed to air.” The small packets are shaken to activate them and then they give off warmth for about 8-10 hours.

 

Brown thrasher 

I taped some of the hand and body warmers to the bottom of plastic containers and ceramic dishes and it has worked really well. Even in freezing weather, the warmers keep the water in the containers liquid all day for birds like the tufted titmice below.

 

As you can see from the accompanying photos, a variety of birds have been using them and it’s been rewarding for both them and me! As I write this in front of my porch window, a yellow-rumped warbler stopped by for a drink.

The larger birds like the crows have not come onto the porch but I hope they have strong enough beaks to break through ice in the ponds and puddles.

The coming week, our temperature roller coaster will return. We’re now expecting to have temperatures in the next two weeks reaching about 65 F° (18 C)!!

As you’ll see in the next blog, when my friend and I visited Yellowstone in the spring, we also encountered temperature roller coasters. Some days we started off bundled up for winter and ended with our jackets off in the afternoon. I am immensely grateful that I’ve been able to cope with these climatic circumstances and will maintain my wood pile in case we lose electricity later this winter and I need to use the fireplace.

 

Emerging again in 2022 – part 2

1 Red-shouldered hawk P1132421© Maria de Bruyn resWhen facing unpleasant challenges, it’s helpful to have an interest to help put them mentally aside while you find enjoyment doing something else. Observing and connecting with wildlife and plant life does that for me. For at least a while, I can think, “I don’t give a shit,” and instead focus on what’s going on immediately around me, like the red-shouldered hawk (Buteo lineatus) above actually giving a shit. 😊

Observing nature also has the added advantage of providing a way to keep learning and being able to appreciate wonders around me that I might otherwise never notice. A number of people have also told me that they enjoy my sharing some of those “discoveries.”

1A white-throated sparrow PC141120© Maria de Bruyn res

White-throated sparrow (Zonotrichia albicollis)

One thing I discovered this year was that I shouldn’t expect pine siskins to come down here to Orange County, NC, every year in winter. I’ve had them visiting during this season many years but so far not one has appeared in my yard. So I’ll share a photo of one from last year; a lovely bird with a scientific name that appeals to me: Spinus pinus.

2 pine siskin P1162664 © Maria de Bruyn res

3 downy woodpecker P8207522© Maria de Bruyn resIt’s my good fortune to live in a home with sizeable front and backyards where I can entice birds to spend time. Nest boxes border the yards and nesting gourds hang on the front porch, so that attracts pairs who raise young ones here in the spring. They also use these nesting sites to spend the night during cold autumn and winter nights. Downy woodpeckers (Dryobates pubescens) seem especially fond of one nest box next to the driveway.

There are varied types of feeders hanging on poles, offering sunflower and other seeds, mixed fruit and nuts, dried mealworms and home-made suet. This arrangement also attracts my avian friends, like the common grackle (Quiscalus quiscula) with its iridescent plumage.

4 common grackle P1175003 © Maria de Bruyn res

5 Carolina wren P1132867 © Maria de Bruyn resSince converting much of my front yard lawn into flower gardens (and I’m working on that in the back, although there I’ve planted more flowering and berry-bearing trees), the insect population has increased. That has helped the pollination of my flowers and provided the resident birds with meals, like one of the 6 or so Carolina wrens (Thryothorus ludovicianus) who occupy specific niches. One pair hangs out near a water-filled tub; another pair hangs out near a brush pile out back and the third pair hops in and out of a brush pile in the front yard.

The wrens change up their diet a bit in winter since being purely insectivorous is difficult then. For example, one of my yard-banded wrens enjoys a bit of suet from time to time. He also likes mealworms, as do the titmice (Baeolophus bicolor).

6 Carolina wren IMG_8993© Maria de Bruyn res

7 Tufted titmouse snow IMG_9006 © Maria de Bruyn sgd

8 Tufted titmouse P1132809© Maria de Bruyn res

9 American goldfinch P1143301 © Maria de Bruyn res

Occasionally, an American goldfinch pair (Spinus tristis) will visit but I’ve been seeing them more often on walks. They like seeds a lot and have eaten many of the grass seeds in my yard already. They search the mosses for tidbits, too.

10 cedar waxwing PC271628© Maria de Bruyn resThe cedar waxwings (Bombycilla cedrorum) are picky eaters. The American robins in my yard ate a lot of the juniper berries they prefer and there weren’t many other berries around (as was the case at the local arboretum). At my house, they’ve mostly been using the small ponds to drink and bathe.

The most numerous species at my yard is the Northern cardinal (Cardinalis cardinalis). At times, I have up to 18-20 of them flying to the tray feeders for seeds. The pokeweed berries are long gone now.

11 Northern cardinal PA074424 © Maria de Bruyn res

There are two pairs of Eastern bluebirds (Sialia sialis) in the yard; at first, they didn’t like having to share space but now they all come to the mealworm feeder at the same time.

12 Eastern bluebird PB212516 © Maria de Bruyn res

13 yellow-rumped warbler PA017988© Maria de BruynIn past years, the visiting yellow-rumped warblers (Setophaga coronata) have lived peacefully with one another. This year, however, I have two birds who seem to be quite incensed when they spy each other. If one is at a feeder, the other zooms in to chase it off and often they flutter upward in a tangle with wings spread. So far, I’ve always been a couple seconds too late to capture the mid-air tussle – it is one of my goals for yard birding this year.

15 yellow-rumped warbler P9093954© Maria de Bruyn

I do enjoy their visits as I find them quite beautiful birds. And they spend a lot of time at the feeders, even when it is raining. Some people here call them myrtle warblers, but I prefer the term yellow-rumped as it is quite accurately descriptive. I loathe the slang term “butter butt” that lots of people here use. Since these warblers are present in many of the nature reserves where I walk, I unfortunately end up hearing the term from time to time. Not sure why it irritates me so much.

16 yellow-rumped warbler PA017970 © Maria de Bruyn

17 yellow-rumped warbler PA018009© Maria de Bruyn

18 pine warbler IMG_9129© Maria de Bruyn resThe pine warblers (Setophaga pinus) in my yard are quite tolerant and polite.

They will share a feeder happily and sometimes also just wait their turn until the feeding area is less crowded.

Less colorful but also a pleasure to see are the female house finches (Haemorhous mexicanus). They seem to come to the feeders less often than their male counterparts.

20 house finch PC101023© Maria de Bruyn res

The Carolina chickadees (Poecile carolinensis) are a delight to see, even if they seem to be in almost constant motion.

21 Carolina chickadee PC230399© Maria de Bruyn res

23 Carolina chickadee PC088891© Maria de Bruyn res (2)

The other bird who also rarely sits still is the lovely little ruby-crowned kinglet (Corthylio calendula). A few years back, I had one that came several winters in a row and who had apparently come to trust me as he would fly over when I brought out fresh suet and even sit on the feeder while I was holding it. He may have attained his natural lifespan (4-6 years) and perhaps it is one of his offspring who now comes.

24 Ruby-crowned kinglet PA158187 © Maria de Bruyn sgd

27 golden-crowned kinglet PC090095 © Maria de BruynI hadn’t had golden-crowned kinglets (Regulus satrapa) in my yard much before this year; now I have at least one living here but s/he never comes to the feeders. Because this bird stays very high and I haven’t had access to my long camera lens for some time, it’s been difficult to get photos at home. I’ve had somewhat more success on walks.

25 golden-crowned kinglet PC090158 © Maria de Bruyn res

26 golden-crowned kinglet PC090099 © Maria de Bruyn res

28 golden-crowned kinglet PC061957© Maria de Bruyn res2 (2)

29 red-shouldered hawk P1071059 © Maria de Bruyn res

Some of my more spectacular yard birds have been the neighborhood red-shouldered hawks. When they fly in, the other birds don’t seem bothered.

These hawks have targeted the amphibians and reptiles (successfully) near the small ponds; they also look for small mammals. While I’ve seen them catch frogs, I haven’t seen them catch birds or mammals.

The young ones are not as reddish as the adults.

30 red-shouldered hawk PB180215© Maria de Bruyn res (2)

I also enjoy seeing these gorgeous raptors on my visits to nature reserves. Some have what seems to me like a sweet expression (like this one below).

31 red-shouldered hawk PC204514 © Maria de Bruyn res

Finally, there is one bird that does make the other birds flee the feeders to seek shelter in bushes, shrubs, woodpiles, etc. That is the neighborhood Cooper’s hawk (Accipiter cooperii). A sharp-shinned hawk visits occasionally, but it is the Cooper’s who comes by regularly. S/he is not shy; about a week ago, the bird flew onto the front porch where it had chased a female cardinal into the living room window. The cardinal flapped on a chair as the hawk peered at her. I banged on the window and ran outside to rescue her. I know the hawk has to eat as well, but I didn’t want to see the dismemberment of this poor bird. I put her in a box in a corner of the porch and she fortunately recovered.

32 Cooper's hawk P1081087 © Maria de Bruyn res

Feathers in the yard and under feeders have shown that the Cooper’s has had successful hunts, so it is doing well.

33 Cooper's hawk P1081094 © Maria de Bruyn res

Next up – my water-loving mammalian friends. Have a nice weekend!

Chilly mornings and nights – birds coping with and resisting the cold!

Many birders focus their attention on nest boxes in the spring and summer, hoping to see avian parents bringing food to nestlings – and if they’re lucky, getting to see the young fledge. Those blessed with yards or a voice in deciding what goes in public spaces may create more such places by putting up nest boxes on poles and trees. (Poles with baffles are a better choice as it makes it harder for snakes and raccoons to enter and eat the eggs and nestlings.)

What many people don’t always realize is that nest boxes can be enjoyable birding spots in the fall and winter, too. As more and more people choose not to leave snags in their neighborhoods and/or have trees removed from properties, birds are losing places to construct their natural nest cavities. Nest boxes help make up a little bit for that habitat destruction.

 

In the winter, birds check out nest boxes to get a head start on choosing possible nesting sites come spring and summer. In my own yard, especially the Eastern bluebirds (Sialia sialis) and brown-headed nuthatches (Sitta pusilla) will visit one nest box after another to decide which one they might choose as a brooding site in the spring. The nuthatches may be accompanied by a youngster from the past summer who will help raise their new siblings.

 

 

Various species of birds also use nest boxes as warm overnight abodes when the temperatures fall to near freezing and below. Besides the Eastern bluebirds and brown-headed nuthatches, I’ve seen white-breasted nuthatches, Carolina wrens (Thryothorus ludovicianus) and downy woodpeckers (Picoides pubescens) checking out a nest box inside and out.

    

Carolina wren                                                 Downy woodpecker

Some species even use a nest box as a communal overnight refuge, with 12 or more birds squeezing together to conserve their body heat. I haven’t seen so many birds enter a box but perhaps I’m not looking at the right time.

The competition for nest boxes as warm overnight roosting spots can also be intense. A male downy woodpecker in my yard has adopted one particular box as his overnight abode, but the bluebirds would rather have the refuge for themselves. He gets there in the late afternoon and sometimes must pass angry birds to squeeze through the hole.

The bluebirds will then scold from atop the box and while hovering in front of the entrance, but he hunkers down and refuses to leave.

It’s interesting to see that the nest boxes also serve other creatures. Various birds perch on nest boxes while checking out the yard to see what’s going on, like this beautiful Northern flicker (Colaptes auratus).

One day, when looking out my window, I was certain I had seen a lizard peeking out of a box hole. Shortly thereafter, when I was outside, I caught a glimpse of a head and went over to open the box. And it turned out that a Carolina anole (Anolis carolinensis) is sometimes using that box as a place to rest! The birds don’t enter when s/he is there as far as I can tell.

When it’s cold and damp, you can also see birds using other measures to stay warm and resist the cold. Most birds eat quite a lot to put on body fat that is used up at night through shivering (which helps keep them warm). This means you may have crowds at bird feeders with species sharing space as they increase their body mass.

You may also occasionally get an “invasion” of one species, like the pine siskins (Spinus pinus).

Puffing up their feathers is another strategy that our avian friends use – they trap pockets of warmer air around their bodies.

Ruby-crowned kinglet (Regulus calendula)

                                              Brown thrasher (Toxostoma rufum)

           

Chipping sparrow (Spizella passerina)         Dark-eyed junco (Junco hyemalis)

The birds keep their feathers in good condition by engaging in vigorous preening. Some water birds oil their feathers to waterproof them, while others grow special feathers that disintegrate, producing a special waterproofing powder. And birds like mallard ducks (Anas platyrhynchos) have a special blood circulatory system in their legs whereby they lose only about 5% of their body heat through their bare feet.

Creating wood piles and leaving dried leaves and stalks from summer and fall grasses and shrubs can provide birds with some shelter from winter winds and cold, so my yard is now home to five wood piles. Several species of birds also seek out protected roosting areas when the deciduous trees and shrubs lose their leaves and the branches no longer provide hiding spots from predators. My native holly bushes serve that purpose for the lovely white-throated sparrows (Zonotrichia albicollis), as well as Eastern towhees (Pipilo erythrophthalmus) and Northern cardinals (Cardinalis cardinalis). I’m glad it keeps them returning to the yard!

As 2021 gets underway, I wish you readers all the best – hope this new year is healthy, happy and as worry-free as possible for you! And thanks for reading my blog. 😊

The birdy breeding cycle 2020 – 2: nest-building

After courtship has taken place, the various bird species get down to the work of constructing nests for their upcoming broods. Even now in July, gray catbirds (Dumetella carolinensis) have been gathering up nesting materials, as have house finches (Haemorhous mexicanus) who have been followed around lately by the members of their first brood.

gray catbird P6147926© Maria de Bruyn res

house finch P7081079© Maria de Bruyn resThe sites they choose can vary considerably. Canada geese (Branta canadensis) tend to locate their nests at the edge of ponds if possible. In one case, a pair built their nest atop a beaver lodge.

Canada goose P4269282© Maria de Bruyn res

Canada goose P4070275 © Maria de Bruyn res

Ospreys (Pandion haliaetus) like to place their nests atop tree snags and will also use special platforms constructed by people for them. A radio tower or stadium lights, such as those at the right, will also do nicely, however.

osprey P5044393 © Maria de Bruyn res              osprey P6126775© Maria de Bruyn res

Northern cardinals (Cardinalis cardinalis) often choose shrubs and bushes; this one built her nest in a Japanese honeysuckle vine that I allowed to grow along the top of a fence surrounding my berry garden.

Northern cardinal 2G0A0652 © Maria de Bruyn res

Northern cardinal 2G0A0001© Maria de Bruyn res

Killdeer (Charadrius vociferous) seem to take the least effort in securing a spot for their nest. It is not uncommon at all to find them scratching out a very shallow depression in a parking lot, pathway or bare bit of ground. This killdeer put her nest on a patch of ground at the edge of a parking lot and, admittedly, it was not very obvious (Look carefully at the center of the photo).

killdeer eggs IMG_2885© Maria de Bruyn res

Nevertheless, people were walking across this patch of ground with their kayaks and canoes that they had just unloaded and the eggs were in danger, even if the parents did their broken wing display to try and lead people away from the area.

killdeer 2G0A8192© Maria de Bruyn res

I found a couple traffic cones and marked off the area, warning someone who had just parked nearby. Then I contacted the park rangers to tell them about it.

killdeer cones IMG_2887© Maria de Bruyn res

Fortunately, the rangers added a third cone and some tape to effectively cordon off the area.

killdeer IMG_5577 © Maria de Bruyn res

Carolina wren eggs IMG_1173© Maria de Bruyn resThe prize for weirdest nest sites will, in my humble opinion, always go to the Carolina wrens (Thryothorus ludovicianus). People in birding groups often post messages about these birds having built a nest under the hood of a car, in an old boot left outside, inside a little-used mailbox or on a door wreath or plant pot. I have a full-sized spare tire atop a tool cabinet and last year, the wrens laid eggs there.

This year, on one of my walks, I discovered wrens who were feeding their babies in a very awkwardly placed nest inside an old cable or wire box on a neighborhood light pole.

Carolina wren P5086279© Maria de Bruyn res     Carolina wren P5181735© Maria de Bruyn res

When I visited some time later, the nest was empty so the babies must have been able to fledge.

Carolina wren P5181745© Maria de Bruyn res

Many birds will use both tree cavities and nest boxes, depending on what is most convenient or available. Sometimes, they make their own new nest holes in snags, like this red-headed woodpecker (Melanerpes erythrocephalus).

red-headed woodpecker 2G0A0033© Maria de Bruyn res    red-headed woodpecker 2G0A0248© Maria de Bruyn res

Northern flicker P4217370© Maria de Bruyn res

This Northern flicker (Colaptes auratus) was very busy working on a new cavity as well. I followed her and her mate for some time but was never able to see them feeding nestlings as our area had several weeks of hard rain and the nearby lake flooded. I didn’t feel like wading through the lake to get to the snag to check up on them, even after the water had receded a bit.

Brown-headed nuthatches (Sitta pusilla) chose a snag that was usually in the water at the edge of Jordan Lake. The hole faced out into the lake so the fledglings were going to have to fly out and veer left or right immediately in order to get to a resting place!

brown-headed nuthatch P4175229 © Maria de Bruyn res

Eastern bluebirds (Sialia sialis) will use nest holes built by themselves or other birds in previous years.

Eastern bluebird P4070231© Maria de Bruyn res

Eastern bluebird P7070899© Maria de Bruyn resThis year, the Eastern bluebird pair who frequent my yard chose not to use their usually preferred nest box. I believe it’s because they could see me watching them and they don’t like that at all! If they see me with my camera, it doesn’t stop them from flying up to the feeder or sitting on a branch near the porch. If I point the camera toward the nest box, however, they stare at me in dismay, remain on branches near the box, and refuse to go in until I shift the camera away. They did come to my feeders multiple times daily to feed their first brood (one of whom is pictured at right), once they had fledged from a nest in someone else’s yard.

Eastern bluebird P7091193 © Maria de Bruyn resTo my surprise, a couple weeks back, the bluebirds chose to use a decorative nest box that I had bought for decoration. It hangs from a pole and sways in the wind and was not really sturdy. The roof began to let loose in the middle and the décor was curling up from the exposure to rain. But when I finally looked in the box when the parents were gone, I found four nestlings inside. They were pretty well grown already and I thought they might be fledging this past week. I didn’t see it, although I did watch a bit. Yesterday, I found one half of the roof on the ground and the nest was empty. I hope that the babies fledged and not that some larger bird plucked them out after the roof came off.

The materials used for nests can differ quite a lot. House wrens (Troglodytes aedon) make loose frameworks of twigs and the nests look pretty messy inside a box.

house wren 2G0A9598© Maria de Bruyn res         house wren P5181711© Maria de Bruyn res

They do seek out some softer materials with which to line the nest.

house wren 2G0A1982 © Maria de Bruyn res

Carolina chickadees (Poecile carolinensis) make beautiful cups of moss and line them with softer materials – plant fluff or hair from mammals that they find.

Carolina chickadee P3285249 © Maria de Bruyn res     Carolina chickadee IMG_8789© Maria de Bruyn res

Cliff swallows (Petrochelidon pyrrhonota) use mud to construct nests, often underneath bridges and rafters in more urban areas.

cliff swallow 2G0A3239© Maria de Bruyn res     cliff swallow 084A3656 © Maria de Bruyn sgd res

It is well-known that hummingbirds use spider web to help hold their nests together. Blue-gray gnatcatchers (Polioptila caerulea) are also known for doing this.

blue-gray gnatcatcher IMG_8085© Maria de Bruyn res

blue-gray gnatcatcher P4027629 © Maria de Bruyn res

I was surprised a couple years ago to find a nest-building Northern parula (Setophaga americana) also collecting spider web – it appears to be a popular construction material for the birds!

Northern parula 2G0A6727© Maria de Bruyn res

I will leave you with a couple photos from one of my favorite types of nests – that of the white-eyed vireo (Vireo griseus). The first time I saw one being built, I was quite surprised as the birds had chosen a low sapling only about 2 feet from a pathway. They weren’t fond of me watching so I took some photos and left. When I returned some days later, they had completed the nest. (The one below is a different bird.)

white-eyed vireo 2G0A5756© Maria de Bruyn res2

The nests are obviously well-made. This year, I came across an empty nest – also in a low shrub right next to a walking path. It has withstood strong winds, heavy rainstorms and other weather. Now it is a lovely decoration for walkers to see as they pass by.

white-eyed vireo P6125921© Maria de Bruyn res

Next up in the blog series: raising babies!

Some previous blogs about nesting can be seen here and here.

The birdy breeding cycle 2020 – 1: courtship and mating

Although we in the Northern hemisphere are already a little more than a month into summer, many species among our avian friends have not yet completed their breeding cycle. In my yard, many parents are still feeding begging (sometimes almost adult) children. Others are feeding young ones in the nest and some appear to be busy constructing new nests for a second or third brood. So, after a long hiatus in blogging, I decided to feature some of my bird friends, including the American goldfinch pair below (Spinus tristis) as they have worked on their new family lives in 2020.

American goldfinch P7130178 © Maria de Bruyn resSome of these photos go back to early spring. A series of misfortunes (including a crash of my laptop hard drive, a broken camera, loss of Internet) meant that I had a backlog of photos to process and then suddenly a large gap in photos taken. But I managed to recuperate some of the work and hope you enjoy the coming series of posts about the birds’ breeding and family life!

belted kingfisher

Breeding season is heralded by increasing bird song in the meadows, forests, fields and our yards. Males especially sing to attract mates and establish territories, but females treat us to songs and calls, too. This makes it easier to spot birds as the tree foliage gets thicker, especially if you have good hearing!

pine warbler P4175086© Maria de Bruyn                     white-eyed vireo P4123164 © Maria de Bruyn res

Pine warbler (Setophaga pinus)            White-eyed vireo (Vireo griseus)

Eastern meadowlark P4279816© Maria de Bruyn res            Orchard oriole P4279889© Maria de Bruyn res

Eastern meadowlark (Sturnella magna)     Orchard oriole (Icterus spurius)

Carolina wren P3316544 © Maria de Bruyn res                 blue grosbeak P4291500© Maria de Bruyn res

Carolina wren (Thryothorus ludovicianus)      Blue grosbeak (Passerina caerulea)

summer tanager P4291520© Maria de Bruyn res

Summer tanager (Piranga rubra)

Indigo bunting P6308502© Maria de Bruyn

Indigo bunting (Passerina cyanea)

Courtship is usually a sweet behavior to watch in my view. The male Northern cardinals (Cardinalis cardinalis) are especially devoted suitors, seeking out nice morsels to present to their intended mates, while among the American crows (Corvus brachyrhynchos), it’s the females who loudly call to their mates for some tasty bites.

Northern cardinal P4164873© Maria de Bruyn res

American crow P4080661 © Maria de Bruyn res

A fact that perhaps many bird lovers do not know is that few male birds have a penis. Like the female birds, most species’ males have a cloaca, a cavity externally located just under the bird’s tail and internally at the end of the digestive tract. Feces, urine, sperm and ova are all deposited in the cloaca. Birds who reproduce with this organ briefly rub their cloacae together (an activity called the “cloacal kiss”) whereby sperm from the male bird’s testes are transferred into the female’s cavity to unite with her eggs. During breeding season, the cloaca is slightly swollen and protrudes a bit from the bird’s body, facilitating the transfer. In the photo of this Carolina wren, you can see a slightly darker area under the tail indicating where the cloaca is found.

Carolina wren P7059955 © Maria de Bruyn res

red-headed woodpecker P4217162© Maria de Bruyn res

When ready for mating, the red-headed woodpeckers (Melanerpes erythrocephalus) seem to focus mainly on chasing away rivals and then snatching a quick mating session. The female woodpecker then takes a break from the chase to rest and have a bite to eat.

Some cliff swallow males (Petrochelidon pyrrhonota) seem to take advantage of females who are preoccupied with gathering mud for their nests for a quick tryst.

cliff swallows 2G0A3283© Maria de Bruyn res

The brown-headed cowbirds (Molothrus ater) seem to take their time for mating. This pair was occupied for at least 5-10 minutes in preparing for the upcoming production of eggs. At times, it seemed like the male was giving the female instructions on what to do once “the deed” was done!

brown-headed cowbird P5097676 © Maria de Bruyn res   brown-headed cowbird P5097677 © Maria de Bruyn res

Many birders do not like the cowbirds because they are parasitic nesters, i.e., they lay an egg in another bird’s nest so that the other bird will raise the young. Since the cowbird baby usually hatches before the other eggs, they either monopolize the food that the foster parents bring or they may even destroy the eggs laid by their foster mother.

brown-headed cowbird P5097682 © Maria de Bruyn res      brown-headed cowbird P5097686© Maria de Bruyn res

It’s been posited that the cowbirds evolved to use this strategy because they followed the bison in migration and therefore couldn’t stay in one place to raise their young. Others believe, however, that the birds developed the practice because dispersing their eggs over several nests gave their young a better chance of reaching adulthood.

brown-headed cowbird P5097689© Maria de Bruyn res

chipping sparrow P6256620© Maria de Bruyn sgd resThe quickest mating scenario I’ve witnessed came from a pair of sweet little chipping sparrows (Spizella passerina). I’d seen the two fluttering together at the feeders and had noted one sparrow chasing another away – which I now think was the victorious suitor driving away a rival. Then one July afternoon, the two flew to a dying cedar and sat close to one another on a branch. Suddenly, Mr. Victory mounted his mate but for what only seemed a few seconds – really very quick work indeed! She sat there with her rear end elevated for a bit and then the two went back to feeding – and soon after I saw them collecting nesting materials.

chipping sparrow P6256622© Maria de Bruyn res    chipping sparrow P6256623© Maria de Bruyn res

The birds in which the males do have a penis include some duck and swan species, ostriches, cassowaries, kiwi and geese. They differ from other birds in that development of the penis is NOT stopped in the male bird embryos during development (the case in cloacal birds).

The mallard males (Anas platyrhynchos), like some other ducks, unfortunately do not treat their partners well. They may mount the female very roughly. During a mating, she may be dunked underwater repeatedly and at length; occasionally, this results in her drowning. This behavior has been the subject of various studies and some newspaper articles with sensationalistic headlines (e.g., “The horrible thing you never knew about ducks)”.

Mallard duck P1232837 © Maria de Bruyn

Mallard duck P1232839 © Maria de Bruyn     Mallard duck P1232840© Maria de Bruyn

Once the actual mating is over, the birds devote most of their energy toward building a nest. While female ruby-throated hummingbirds (Archilochus colubris) must construct her nest and tend her babies alone, many other birds cooperate in the venture, like the Eastern bluebirds. Their efforts are featured in the next blog. (And if you’d like to see a previous post on courtship, it is here.)

ruby-throated hummingbird 2G0A4084© Maria de Bruyn res