Olive-sided Flycatcher

The Olive-sided Flycatcher is a large, robust, big-headed flycatcher of coniferous forests, easily recognized by its distinctive plumage pattern: dark olive-gray sides and flanks that form a vested appearance, separated by a white stripe down the center of the breast, sometimes likened to an unbuttoned vest. It habitually perches on the very top of a dead snag or exposed branch, often at the edge of a forest opening or burn, giving it excellent visibility for spotting flying insect prey.

The species' cheerful, far-carrying song, often rendered as "quick, THREE BEERS!", is one of the most recognizable sounds of montane and boreal forests in summer. Populations have declined significantly in recent decades, likely linked to habitat loss on both breeding and wintering grounds, leading to its Near Threatened status.

Key Field Marks

• Large size and a big, blocky head for a flycatcher
• Dark olive-gray patches on the sides of the breast forming a "vested" look, separated by a white stripe down the center
• Short tail and long wings extending well past the tail base
• Often shows a small tuft of white plumage on the flanks near the rump, sometimes visible as "cotton puffs"

Similar Species

• Eastern Wood-Pewee and Western Wood-Pewee are smaller, lack the vested breast pattern, and have proportionally smaller heads.
• No other North American flycatcher shares this distinctive dark-sided, white-striped breast pattern.

Olive-sided Flycatchers breed across boreal and montane coniferous forests of Canada, Alaska, and the western mountains and cooler parts of the northeastern United States, favoring forest edges, burned areas, bogs, and other openings with scattered tall dead trees for perching.

The species undertakes one of the longest migrations of any North American flycatcher, wintering primarily in the Andes of South America.

Voice

Sings a loud, cheerful, far-carrying "quick, THREE BEERS!", one of the most distinctive and easily learned flycatcher songs in North America; also gives a sharp pip-pip-pip call.

Feeding

Sallies from a high, exposed perch to catch flying insects, especially favoring bees, wasps, and winged ants, often making long aerial sorties and returning to the same conspicuous perch.

Nesting

Builds a shallow, loosely constructed cup nest of twigs, typically placed far out on a horizontal conifer branch, well concealed by needles from above.