Olive-sided Flycatcher

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{{Taxobox | color = pink | name = Olive-sided Flycatcher | image = OlivesidedFlycatcher23.jpg | regnum = Animalia | phylum = Chordata | classis = Aves | ordo = Passeriformes | familia = Tyrannidae | genus = Contopus | species = C. cooperi | binomial = Contopus cooperi | binomial_authority = (Swainson, 1832) }}

The Olive-sided Flycatcher, Contopus cooperi, is a passerine bird. It is a medium-sized tyrant flycatcher.

Adults are dark olive on the face, upperparts and flanks. They have light underparts, a large dark bill and a short tail.

Their breeding habitat is coniferous woods across Canada, Alaska and the northeastern and western United States, and other types of wooded area in California. The female usually lays 3 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.

These birds migrate to Central America and the Andes region of South America.

They wait on a perch at the top of a tree and fly out to catch insects in flight.

The song is a whistled quick-three beers. The call is a rapid pip pip pip.

The numbers of this bird are declining, probably due to loss of habitat in its winter range.