The Story
Head tipped low and one dark eye on the lens, the bird against this blur of snow is a black-capped chickadee, and it has the look of a small auditor going over the books. The clip counts down five things this species can do, and the best of them are answers to winter.
At this range the marks are easy: black cap, white cheek, black bib, and a tiny pointed bill aimed downward. A buff wash runs along the side. Nothing here says male or female, because the two look identical. The whole package is about the size of a sparrow and weighs 0.3 to 0.5 oz.
The countdown opens with feeding upside down, and this tilted stance is a fair hint of the bird's working geometry. Chickadees forage mostly by hopping among twigs and gleaning, often hanging upside down to reach the underside of a branch. Whether this one is feeding, the frame does not say.
Memory takes two of the five places, and the numbers explain why. In fall a chickadee can store up to 1,000 seeds a day, or 80,000 in a season, tucking them into bark crevices and small cavities. Each one is a location to recover later. One study of wild birds found new neurons joining the hippocampus, the brain's spatial-memory area, all year, with a peak in October. Hippocampus size also runs larger in chickadees from colder, harsher places.
The clip saves its top spot for the night. On the coldest nights a chickadee can let its body temperature slide from 107.6 °F to 82 °F, saving energy that would burn off in the dark. It sleeps in thick branches or a tree cavity, beak tucked under its wing.
The days are spent paying for all this. A chickadee eats more than 35 percent of its weight daily and can hold a 100 °F body temperature even when the air is 0 degrees. Mostly a permanent resident, it stays for the whole bill, and from first light it is back on the twigs.




