The olive-sided flycatcher (Contopus cooperi) is a passerine bird. It is a medium-sized tyrant flycatcher.
The olive-sided flycatcher is a stocky bird with long wings. The bird has gray brown top feathers, dark gray sides, and a white chest. Olive tones may be visible in optimal lighting and fresh plumage.
Measurements:
They wait on a perch at the top of a tree and fly out to catch insects in flight.
The female usually lays three eggs in a shallow open cup nest on a horizontal tree branch. The male defends a large area around the nesting territory. Both parents feed the young birds.
Of all the flycatcher species that breed in the United States, the olive-sided flycatcher has the longest migration. Some olive-sided flycatchers migrate up to 7,000 miles traveling between central Alaska and Bolivia.
The numbers of this bird are declining, probably due to loss of habitat in its winter range.