Northern US & Canada
Black-capped Chickadee
Poecile atricapillus
Mixed forests, backyards· 5 in / 13 cm
"A chickadee-dee-dee call where the number of dees signals danger."
The story
Chickadees grow new brain cells every autumn to remember thousands of seed-cache locations. Their alarm call is a real language — more dees mean a more dangerous predator.
Conservation
Common, but sensitive to habitat loss in mature forests.
One small thing you can do
Hang a suet feeder in winter — they'll visit dozens of times a day.