In the spring of 2015, a male House Wren and his mate built their nest inside a nestbox near a honeysuckle. His mate laid her eggs and dutifully incubated them. Then, one morning— cheep! cheep! High-pitched calls and gaping red mouths cried hungry, daddy! and the male wren was off in a paternal tizzy, collecting bugs and delivering them to his new offspring.
It was, maybe, odd that his new offspring weren’t in the nest that he had built. It was, maybe, odd that other, larger birds were also feeding his babies. It might even have been called odd that his mate was still sitting in their nest, atop whole and silent eggs. But— cheep! No time for that! The chicks were hungry!
What this male House Wren was doing, no doubt to the profound irritation of his mate, was feeding the offspring of a pair of Northern Cardinals who had nested in the honeysuckle near his nestbox.
Don’t worry: this isn’t Lewis Carroll’s maddeningly unanswered riddle “Why is a raven like a writing desk?” (Although, if you’re interested, it turns out that has been answered.) There is an answer to this one—two answers, in fact.
Answer 1: They both make sounds by vibrating strings.
Well, strings, feathers—they’re all the same, right? This Club-winged Manakin produces its courtship song by vibrating its wing feathers: they strike each other about 107 times per second.
We know a little bit about how dinosaurs probably looked: we’re learning that a lot of them had feathers, and even beginning to be able to figure out what patterns might have been on their plumage. But there’s a lot we don’t know; we may never know for sure.
In evolutionary biology, when you don’t know something about an extinct species—what kind of nest it built, or what sounds it made, or how many babies it had—you look at the species that evolved from it. You infer that it probably was similar to at least some of its descendent lineages. For dinosaurs, then, we would look at birds.
I remember, as a kid, thoughtfully coloring my dinosaur coloring books and paper-mache dinosaur scultures in shades of green and brown. I knew about camouflage, and I was sure that this earthy color palette must have been the one favored by these animals. Silly me.
This Chestnut-backed Chickadee is molting his head feathers, hence the odd colors.
After breeding, if you’re a bird, comes molting. Time to discard those old, worn, raggedy flight feathers and start with some fresh ones for the long haul of the fall molt, or replace sparse downy feathers with good warm ones for the cold of winter. This means that around now—from mid-July to September—you may see a lot of birds who aren’t looking their best.
The sun dips low over the bay, its fading rays gilding the avocets as they swish their heads through the water. The egrets eye their own reflections as if in profound self-contemplation. A willet flashes past, its black-and-white wings an exclamation in the dusk.
Faced with such beauty, two words come irrepressibly to mind: niche partitioning.
Something is not quite right here. What is it?
The baby bird says “FEED ME!!” but it doesn’t know that you’re not this momma Cliff Swallow.
One of the veterinarians at the animal rehabiliation hospital recently lamented to me that so many animals she sees are “killed with kindness.” The most common problem by far is that of feeding baby birds. Well-meaning rescuers find a baby bird in need; they search the internet and find statements like “Baby birds must be fed every hour or they will die.” Terrified that the bird will starve before they can get it to the animal hospital—maybe the hospital is closed for the night; maybe it’s a 40-minute drive away—they feed the bird. It makes intuitive sense that babies need to eat, after all. What is not intuitive to us is how easy it is to fatally injure a baby bird by feeding it incorrectly.
“Nowhere on the internet says ‘It’s okay to not feed baby birds for a while, they won’t starve,'” the vet said. “And then they come in fed on milk or something, because the internet said that was a good idea, and they die.”
So: It is okay to not feed baby birds for a while. They will not starve in the several hours it takes to get them to the animal hospital. They will not starve overnight if you find them at 6pm and the animal hospital doesn’t open until 9am the next morning. Baby birds expect to fast the night: their parents sleep, after all. The risk to the bird of starvation is much smaller than the risk of a human trying to feed it without the necessary expertise.