The birdy breeding cycle 2020 – 4: growing into adult plumage

As mentioned in a previous blog, when young birds are ready to leave the nest, they don’t necessarily look like their parents. Many of the altricial birds (ready to move about and forage on their own) may resemble fluffy versions of the adults, as is the case with these hooded merganser ducklings (Lophodytes cucullatus) following their mother.

The brown-headed nuthatch babies (Sitta pusilla) look very much like their parents. Sharp-eyed observers might notice that the tops of their heads are not as brown as those of their parents.

The Eastern meadowlark juveniles (Sturnella magna) resemble their parents but lack the bright yellow and black coloring on the throat and breast.

 

The difference between adult and juvenile downy woodpeckers (Picoides pubescens) is subtle. The female woodpecker has no coloring on the top of her head, which is simply bedecked with the white and black feathers that cover the rest of her body.

The male woodpecker has a red patch on the back of his head.

The immature woodpecker has a red patch on top if the head and this is lost as the bird reaches adulthood.

The Northern mockingbird youngling (Mimus polyglottos) resembles mom and dad quite a bit except for some spotty streaking on the chest.

In other species, the babies start out looking quite different from their parents. Spots characterize many members of the thrush family, with birds like wood thrushes (Hylocichla mustelina) and hermit thrushes (Catharus guttatus) retaining the spots in adulthood.

   

The Eastern bluebirds (Sialia sialis) and American robins (Turdus migratorius), on the other hand, are only strongly speckled as immature birds, losing their spots as they mature.

In some cases, the birds undergo color changes. Male summer tanagers (Piranga rubra) start out yellow-orange with their reddish coloring appearing in patches until they finally achieve their very bright adult red hue. Some of the immature birds are really quite beautiful with their mottled colors.

 

   

The male blue grosbeaks (Passerina caerulea) start out brown and gradually achieve their dark blue feathers with some reddish/brown wing accents.

 

 

Among the birds that undergo a major change are the European starlings (Sturnis vulgaris). The young birds start out with dullish brown or gray hues with some streaking. Eventually, they begin to develop some spotting and then ultimately achieve the beautiful adult summer glossy feathering with green and purple hues mixed in.

 

 

The females of the Eastern towhee species (Pipilo erythrophthalmus) have a brown back above a white breast with reddish sides, while the males have black backs.

The young developing towhees keep you guessing as to their sex since they undergo quite a lot of color changes as they develop. They do have the white in their tails, which helps you identify them as to species.

 

  And then we come to the hawks and owls. It is not unusual for the young raptors to look nothing at all like their parents. The red-shouldered hawks (Buteo lineatus) start out looking like fluffy and then becoming gradually kind of scruffy looking.

     

As they get a little older and leave the nest, they start to resemble their parents more but have more streaking on the breast. As they near adulthood, they look much more like mom and dad.

 

And we end with an example of another raptor. There is a real difference between the baby great horned owl (Bubo virginianus) and its parent as you can see. Many birds are impressed by the adults but ooh and aah over the nestlings. It must be the combination of those big eyes and fluffy feathers that take away attention from the already formidable claws!

               

Next up – a foray into the world of amphibians and reptiles!

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

Braeburn Farm is for the birds!

I don’t often get the chance to visit a farm (other than organized farm tours, which are a bit pricey and then might be crowded). Last year, I was invited to one during an annual llama shearing, which was educational. This year, however, I’ve had the chance to visit Braeburn Farm four times so far because the owner and manager have decided to make it a nature reserve as well as a cattle farm. Nick, the land manager, is a birder who is more than willing to share his knowledge with the visitors.

pond I77A6227© Maria de Bruyn res

My first visit to this farmland/nature reserve was in the early spring to see Wilson’s snipes at one of the five ponds. By late June, these birds had moved on but the ponds were now harboring mallards (Anas platyrhynchos), red-winged blackbirds (Agelaius phoeniceus), belted kingfishers (Megaceryle alcyon) and killdeer (Charadrius vociferous).

mallard duck I77A7320© Maria de Bruyn res     red-winged blackbird I77A6920© Maria de Bruyn res

belted kingfisher I77A6936© Maria de Bruyn (2)   killdeer I77A6934© Maria de Bruyn res

My quest to see green herons at one pond was unsuccessful, but my 20-minute walk there was accompanied by the non-stop screaming of a red-tailed hawk (Buteo jamaicensis), who called both from tree tops and the air as she circled overhead.

red-tailed hawk I77A6030© Maria de Bruyn res   red-tailed hawk I77A6044© Maria de Bruyn res

A non-native bird who might greet you as you come down the road near the farm manager’s home is a helmeted guineafowl (Numida meleagris), the sole survivor of a neighbor’s flock. This bird now comes to visit the domestic chickens (Gallus gallus domesticus) at Braeburn, perhaps seeking some companionship in addition to the easily available chicken feed.

helmeted guineafowl I77A5648© Maria de Bruyn res    chicken I77A6958© Maria de Bruyn (2)

chicken I77A6949© Maria de Bruyn resThe farm chickens are in a large pen while other chickens run free, including one with a wild hairdo.

A trio of wild turkeys left the woods and entered a field during one of my visits but they were at a considerable distance; still, I could say I had seen them that day! The Eastern meadowlarks (Sturnella magna) have often been visible at a distance in the fields, but on my last visit I saw one a bit closer on a fence post, giving me the chance to enjoy its beautiful plumage.

 

Eastern meadowlark I77A8597© Maria de Bruyn    Eastern meadowlark I77A5898© Maria de Bruyn

Eastern kingbird I77A5683© Maria de Bruyn res

 

Eastern kingbirds (Tyrannus tyrannus) can be seen in many of the fields and on wires. They take advantage of the ponds to snag dragonfly meals and the dry grasses provide materials for nests.

 

Eastern kingbird I77A7653© Maria de Bruyn        Eastern kingbird I77A7099© Maria de Bruyn res

They also pose very prettily on the shrubbery!

Eastern kingbird I77A7007© Maria de Bruyn   Eastern kingbird I77A6380© Maria de Bruyn res

grasshopper sparrow I77A7118© Maria de Bruyn res

 

The grasshopper sparrows (Ammodramus savannarum) are numerous, which was lovely for me as this species was a lifer for me. If you approach on foot, they fly off, but Nick said they are so used to his motorized cart, they stay put as he chugs on by!

 

grasshopper sparrow I77A6976© Maria de Bruyn res      grasshopper sparrow I77A5738© Maria de Bruyn res

Savannah sparrow I77A8690© Maria de Bruyn res

 

In the spring, when we had gone to see the snipes, we were lucky to see savannah sparrows (Passerculus sandwichensis) running about in the grass (I had at first thought we were seeing field mice scurrying about).

 

 

 

orchard oriole I77A7271© Maria de Bruyn resIn June, a pair of orchard orioles (Icterus scpurius) had built a nest in a tree bordering one pond and I was excited to see two babies just days before they fledged. The father was feeding them and brought one baby a large cricket, which seemed to be too large for it swallow easily. Dad tried to help by pushing it down but when I left, the insect was still sticking out of baby’s mouth and its sibling was still hungry, too.

orchard oriole I77A7475© Maria de Bruyn res

orchard oriole I77A7510© Maria de Bruyn    orchard oriole I77A7500© Maria de Bruyn

barn swallow I77A7161© Maria de Bruyn resThe barn swallows (Hirundo rustica) adopted an abandoned barn as their hotel of choice. When I visited in June, the young had just been fledging; they and their parents were circling the barn and resting on fences nearby, showing off their beautiful colors.

In July, a few stragglers remained in nests. Some that had taken the great leap were hanging around outside, even clutching the barn wall.

barn swallow I77A7062© Maria de Bruyn res        barn swallow IMG_4527© Maria de Bruyn

barn swallow I77A7145© Maria de Bruyn res

barn swallow I77A7139© Maria de Bruyn res

Others were enjoying the view on a wire line, together with some purple martins.

barn swallow I77A6990© Maria de Bruyn res

The fence posts and other farm structures offer resting places for various birds, like the Eastern wood peewee (Contopus virens), chipping sparrow (Spizella passerina), house finches (Haemorhous mexicanus) and Eastern bluebirds (Sialia sialis).

Eastern wood-peewee I77A6694© Maria de Bruyn res    Eastern wood peewee I77A6675© Maria de Bruyn res

chipping sparrow I77A6665© Maria de Bruyn res   house finch I77A6529© Maria de Bruyn res

Eastern bluebird I77A5859© Maria de Bruyn res  Eastern bluebird I77A5847© Maria de Bruyn res

turkey vulture I77A7105© Maria de Bruyn res

 

The turkey vultures (Cathartes aura) take advantage of the cattle’s well-water stations to get a drink, but then may retire to a tree branch for a bit of sunning. Nick likes them better than the black vultures, who had killed a newborn calf when its mother wasn’t taking care of it.

 

 

turkey vulture I77A7107© Maria de Bruyn res    turkey vulture IMG_4469© Maria de Bruyn res

Northern mockingbird I77A7669© Maria de Bruyn res

 

Other birds, like the Northern mockingbirds (Mimus polyglottos) and great-crested flycatchers (Myiarchus crinitus) enjoy the view from the vantage of high branches in trees.

 

great-crested flycatcher I77A7199© Maria de Bruyn res     great-crested flycatcher I77A7193© Maria de Bruyn res

While the 500-acre farm is mostly advertised in relation to its beef and opportunities to hold events such as receptions there, the farm management is now increasingly promoting it as a place for wildlife observation as well. The biodiversity in birds, mammals, insects, reptiles and plants is wonderful and my next blog will focus on examples of the non-avian wildlife to be seen there. If you’d like to visit the farm, do contact them!