The most widespread, numerous, and geographically variable chickadee, this bird brightens winter days at bird feeders and eagerly takes advantage of nest boxes ... Length 5.3". Black cap; white ...

Black-capped and mountain chickadees are closely-related species that co-occur in Boulder County but occupy different habitats based on elevation. The Boulder Chickadee Study leverages an extensive ...

They nest in dead aspens because the soft wood ... but the easiest version to learn to recognize is that of the black-capped chickadee with its chick-a-dee-dee-dee call. Most chickadees, the ...

One look at the photo, and I instantly understood both the observer's confusion and the mystery bird's identity. It turned out to be a black-capped chickadee with a condition known as “leucism” ...