Olive-sided Flycatcher Contopus cooperi

Stocky flycatcher that almost always perches conspicuously on a high bare perch with an upright posture. From the front, look for dark sides creating a vest, with a bright white stripe from throat to belly. White patches on the sides of rump are sometimes visible from behind. Most similar to pewees but larger and larger-billed, with more contrasting vest. Feeds on insects. Breeds in clearings and bogs in boreal or mountainous forests, but can be found in migration in open habitats with a mixture of woods and clearings. Distinctive whistled song is often likened to "quick, three beers;" also listen for "pip" call notes.