When it’s time to eat your own skin

Several years ago, I bought a couple hard polyethylene pond liners and dug two large holes in my clay and rock-filled back yard. I wanted to have a pond area and figured that two big tubs would be easier to manage and clean than maintaining an in-ground pond. So far, that has been the case except for the fact that I couldn’t keep any fish – a great blue heron managed to eat all the fish I had over the course of about 2-3 years.

That doesn’t mean my pond is not populated, however. Indeed, all the water sources in my yard have residents. Some are unwanted – for example, the mosquito larvae that I admittedly kill with mosquito dunk. The Cope’s gray tree frogs (Hyla chrysoscelis) have a preference for my rain barrels. Somehow they manage to crawl inside even when a lid is on and they deposit hundreds of eggs per season.

   

Fortunately, not all of the frog eggs hatch or my yard would be overrun and the sound in the evenings would be overwhelming. Even the half-dozen or so current adults manage to produce quite a loud concert series – I’m surprised neighbors haven’t asked me to do something to tamp down the sound!

I used to have bullfrogs in my container ponds but haven’t seen them this year. Instead, my neighbors have been lovely green frogs (Rana clamitans). One grew to a very large size and he was joined by two others of a bit smaller stature.

They aren’t very noisy, mostly croaking in the late afternoon. It must have been that sound that attracted another neighborhood resident whom I spotted one day sitting on a nest box next to the pond. The red-shouldered hawks (Buteo lineatus) have spent time watching the pond before when in the mood for frog legs; this was a young hawk who had obviously been in the pond as evidenced by his wet plumage.

The pond was quiet for a few days and I thought the hawk must have had a good meal. And then, slowly, the frogs began to emerge again. There are three that sit on the rocks surrounding the larger pond although one is a bit smaller. This makes me think the hawk might have gotten one but that a juvenile frog was now accompanying the larger pair.

   

When my pond “greenies” croak, they don’t seem to get very large inflated vocal sacs. At the NC Botanical Garden, fellow photographer Mary showed me a green frog that she had been photographing and he croaked a couple times. It went too fast to get a good shot so I offered to make him “talk” by croaking at him. My pathetic attempt at imitating him really was quite pitiful, but amazingly did evoke a response. His vocal sac didn’t get really large either though.

One day, I spotted one of the yard frogs sitting on a rock, opening and closing its mouth without making a sound.

 

When I looked more closely, it seemed to have some membrane hanging on its side.

Then I saw that it was partly in the frog’s mouth and the amphibian was tugging away at it. I wondered if he was sick.

It turns out that he was perfectly healthy and staying that way by eating his own skin! These amphibians regularly shed their skin because it would otherwise harden and make it difficult for them to absorb oxygen while underwater, where they spend a considerable amount of time. So periodically, they scrunch themselves together and then stretch to break the skin so that it can be pulled off, leaving supple skin behind to better enable the “breathing” method called cutaneous gas exchange.

But why do the frogs then eat their skin? It actually has many nutrients, including calcium and proteins. I have no idea if the skin has any taste and whether they enjoy ingesting it. It seemed to be a bit of a laborious process when I watched this frog go through the process. Added to that is the fact that they actually use their eyeballs to push food down their throats and you discover that our froggy friends have quite a unique digestive process!

 

Outside my yard, I’ve not seen too many frogs this year. There was a lovely little Northern cricket frog (Acris crepitans) out and about on one of my walks.

More recently, I’ve been seeing Fowler’s toads (Anaxyrus fowleri) in the woods and parks.

 

     

At the NC Botanical Garden, I had the chance to see some rather large tadpoles sharing a pond with smaller ones.

It was interesting to see that the tadpoles first develop their hind legs and then their front legs before eventually losing their tails.

Finally, one more type of interesting creature I’ve been observing lately on walks are land snails. They don’t really belong in a blog that is about amphibians but it’s unlikely I’ll be writing one about mollusks any time soon. So, I’ll leave you here with a few photos of what I thought were some snails with beautifully spiraled shells. Have a good day or evening!

 

 

 

Tropical storm Florence causing “cabin fever”

The laptop on which I store most of my photos for processing began malfunctioning about a month ago and when it briefly works, I hurriedly back up files on it so I don’t lose them. That has delayed my processing photos and writing more blogs about wildlife I saw this year in Costa Rica and The Netherlands, so I’m taking the opportunity to focus on some current sightings. As Hurricane Florence neared North Carolina, I got in plenty of cat food and litter, bird seed and some non-perishable foods for humans and then cleared the yard of garden art and bird feeders that could become flying projectiles.

In the meantime, the Carolina chickadees (Poecile carolinensis) checked out bird houses as possible shelter from the storm.

How lucky I and most other people in NC’s Triangle area have been so far! The slowly-moving storm turned southeast and is now going northwest, largely bypassing us with the direct impact that had been predicted. We have had rain every day and the ground is very sodden. As I write this now, we are having one of the heaviest downpours of the last week and I keep my fingers crossed that the large oaks and persimmons in my yard do not topple over. Three people were killed by trees falling on their homes and others have had power outages due to fallen trees the past few days. Our neighborhood usually is one of the first to lose power because of the many large old trees we have but so far, so good.

I just had to go out for a walk in the neighborhood today, after only going outside daily to hang and take down bird feeders. Cabin fever had struck, so I spent 90 minutes strolling along. The neighborhood listserv informed me that a few minutes after I passed a certain intersection, a neighbor was almost hit by a falling pine tree, so I was lucky again. And another tree blocked the street further down but we have not lost power yet.

My first destination was the creek downhill from us, which normally rises above its banks, flooding the street next to it. It was nice to see American beautyberries (Callicarpa americana, about which I wrote my last blog) in several neighbors’ yards along the way. The birds have numerous good autumn dining areas available!

When it rains, water from areas north of us runs through our neighborhood to reach Bolin Creek, which also carries stormwater from neighborhoods further upstream.

When I reached the street that runs alongside the creek, I was pleasantly surprised to see that it had not (yet) flooded. (We had at least another 24 hours of rain coming, so it might go outside its banks some time tomorrow.) Some stretches were relatively calm, like this area with a tree that has apparently been marked for removal later (I’m guessing this).with water rising near the walking path.

In a couple spots, the water was rising quite near the walking path (along which some runners passed by as I walked along).

There were pretty wildflowers growing alongside the creek.

 

  

The creek was not only carrying falling rainwater and stormwater from upstream, but also transporting water being funneled into it from our neighborhood as it crossed the street. Not all of the passing drivers were considerate, some going quickly through the water and splashing me as I walked along the sidewalk. In some areas, the water rushing along had to traverse rocks and looked a bit wilder.

I left the creek to walk along neighbors’ yards. One of them had some beautiful spider flowers (Cleome hassleriana), which I have been unable to propagate in my garden, despite a neighbor having given me some to transplant several times.

 

They had some lovely Rose of Sharon (Hibiscus syriacus) as well, which I luckily do have in my yard.

I’m unsure what this particular flower is, but it is lovely.

One neighbor’s large fig tree (Ficus carica) was laden with fruit, which I took as a hopeful sign that my two small fig trees might one day provide this tasty treat as well.

  

As I walked along, I came across two young children who were examining a neighbor’s large tree that had had several huge limbs crack off onto their lawn. The young girl was thrilled with her father’s large umbrella – I asked if she had seen the film Mary Poppins and she said no, but they were going to see the play! Her brother brought me a rock with a leopard slug on it, very proud of his find. He pointed out that it had a hole on the side of its head and I was able to inform him that this was normal for these slugs (something I only found out when I wrote a recent blog about their mating behavior).

After checking in on an elderly neighbor to see if she needed anything, I picked up small fallen branches in my yard and examined the plants, noting that the pokeweeds (Phytolacca decandra) still had a few ripe and some green berries so that the birds and deer would still be able to enjoy a few of those.

My outing in the rain ended with a few minutes watching the tadpoles in a small container, several of whom were well on the way to becoming frogs. It was a pleasant if somewhat soggy walk and so nice to get out of the house again.

In the meantime, my thoughts are with the many people who have been displaced and lost their homes to Hurricane/Tropical storm Florence and – across the world – Typhoon Mangkhut. If you can spare some funds, you can always donate to a North Carolina relief fund and/or the Red Cross/Red Crescent societies.

An update on 17 September: all night our area had torrential rain and some thunder and lightning. Shortly after posting this, Bolin Creek overflowed and led to evacuation of people from a housing complex. It is now almost 8 a.m. and it is still a torrential downpour with repeated tornado warnings. Florence had saved her biggest impact for our area for the end of her journey through North Carolina!