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 ...

Learn how to locate the easily-identified, boldly hued black-and-white warbler. This bird is an efficient forager for insects ...

The black-capped petrel is a small seabird with long, black-framed wings that is also known as diablotin, or “little devil,” due to its eerie nighttime mating calls. These birds nest in the Caribbean ...

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 ...