Black-capped Chickadees stay in Minnesota all winter. They eat seeds and insects or larvae when they can find any. They come to feeders where I offer sunflower seeds, safflower seeds, and peanut chips. This feeder hangs over the pond with an extra branch for the birds to perch on.
From November to April I watch, count, and report the birds I see as a citizen scientist. Cornell Lab of Ornithology is replete with data and information about birds.
https://www.birds.cornell.edu/home
This pond is covered with snow, and a layer of ice under that. The turtles are hibernating below in the mud. The muskrats are snug in their burrows. It looks quiet and peaceful on the pond, but there is a lot going on in all seasons.