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It’s easier for big birds to keep warm, but some tiny species — like chickadees and kinglets — also are adapted to Northwest winters.

The scientific content is enlivened with explorations around Heinrich’s cabin in Maine, as well as results from his own delightfully ghoulish experiments — like heating up a dead kinglet and measuring its cooling rate.

Seen here are everyday delights such as chickadees, kinglets and nuthatches, to Cooper’s hawks and even in some years the tiny northern Saw-whet owl, in addition to common barred owls.

I want to know the chickadees, bushtits, warblers and finches, barn swallows, wrens and the tiny ruby-crowned kinglet.

The lab has created maps so far for 107 species, from easy-to-spot birds such as pelicans, herons, eagles, vultures, robins, blackbirds and swallows to the more elusive warblers, buntings and kinglets.