Three or four slow-moving squirrels crowd onto the big tulip tree. But there’s a loner 50 feet away, diving repeatedly into the snow as if unable to locate a buried nut. After a while, he retreats into the canopy to eat black birch seeds.

A wedge of yellow light in the clouds for half an hour past sunrise. I’m learning to spot when a squirrel is about to dig up a nut: it stares off into space in one last effort to convince any watcher that it’s doing something entirely different.