Donald M. Jones / Black-capped Chickadee (Poecile atricapillus) in winter, Troy, Montana

Alan Murphy / Black-capped Chickadee (Poecile atricapillus), Texas

Alan Murphy / Black-capped Chickadee (Poecile atricapillus) during snowfall, Alaska

Marie Read / Two Black-capped chickadees (Poecile atricapillus) in mid-air fight by a sunflower, New York, USA, February

Steve Gettle / Black-capped Chickadee (Poecile atricapillus), Kellogg Bird Sanctuary, Michigan

Steve Gettle / Black-capped Chickadee (Poecile atricapillus), Kellogg Bird Sanctuary, Michigan

Steve Gettle / Black-capped Chickadee (Poecile atricapillus) on child's hand, Kensington Metropark, Michigan

Steve Gettle / Black-capped Chickadee (Poecile atricapillus), Huron Meadows Metropark, Michigan

Steve Gettle / Black-capped Chickadee (Poecile atricapillus) with berries, North America

Donald M. Jones / Black-capped Chichadee (Poecile atricapillus) in spring, western Montana

Donald M. Jones / Black-capped Chichadee (Poecile atricapillus) perching on snow-covered berries, western Montana

Scott Leslie / Black-capped Chickadee (Poecile atricapillus) flying, Granville Beach, Nova Scotia, Canada