Birds diurnal

Olive-sided Flycatcher

Contopus cooperi

A champion of the high canopy, the Olive-sided Flycatcher is famous for its dapper 'vested' plumage and its ringing forest call. This migratory marvel brings a touch of wild mountain spirit to any backyard with tall evergreens.

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Quick Identification

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Size

Length: 18-20 cm (7-8 in); Wingspan: 31.5-34.5 cm (12-14 in); Weight: 28-37 g (1-1.3 oz)

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Colors

Sooty brownish-gray upperparts; white throat, breast, and belly with dark olive-gray 'vested' sides; bill is dark with a pale base on the lower mandible.

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Key Features

Dark brownish-gray 'vested' appearance over a white underbelly
Large, heavy bill with a hooked tip
Frequent perching on the highest dead branches of tall trees
White tufts occasionally visible on the sides of the rump

When You’ll See Them

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Activity pattern diurnal

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Peak hours 6-10 AM and 4-7 PM

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Season May-August

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Diet Strictly insectivorous; specializes in catching large flying insects like bees, wasps, winged ants, beetles, and dragonflies in mid-air.

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Habitat Coniferous forests, particularly near edges, clearings, or burned areas with standing dead trees (snags).

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Behavior

The Olive-sided Flycatcher is a master of the 'sallying' hunting technique. It spends much of its day perched conspicuously on the highest available snags or dead branches of tall conifers. From these vantage points, it scans the air for large flying insects, launching into acrobatic aerial pursuits before returning to the same branch or a nearby perch to eat its prize.

Highly territorial during the breeding season, these birds are known for their aggressive defense of their nesting sites, often chasing away much larger birds like hawks or ravens. Despite their bold defensive behavior, they are relatively solitary and are most easily located by their loud, distinctive three-note whistle, which birders often translate as 'Quick, three beers!'

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Camera Tips

Capturing the Olive-sided Flycatcher requires a strategy focused on verticality. Unlike many backyard birds that visit low feeders or birdbaths, this species is a canopy specialist. To get a clear shot, mount your camera at a high vantage point—such as a second-story deck or a specialized high-reaching pole—directed toward the tips of the tallest dead trees or 'snags' in the area. These birds have a strong site fidelity for their favorite hunting perches, so if you see one landing on a specific branch, it is highly likely to return to that exact spot multiple times a day.

Because these birds are remarkably fast when they dive after insects, trigger speed is everything. Set your AI-powered camera to its highest sensitivity and use a 'Burst' or 'Photo + Video' mode. A trigger speed of 0.2 seconds or less is ideal to ensure you catch the bird before it launches. If your camera settings allow for it, prioritize a high shutter speed to freeze the motion of their rapid wingbeats during takeoff and landing.

Lighting can be a significant challenge since these birds often perch against a bright sky, which can lead to silhouetting. If possible, position your camera so the sun is behind it, illuminating the bird’s front to capture the detail of its characteristic 'vest.' In your camera’s software settings, look for an 'HDR' or 'Backlight' mode to help balance the exposure between the dark bird and the bright background. Avoid using traditional bird feeders as bait, as these birds only eat live, flying prey; however, maintaining a wildlife pond that attracts dragonflies and bees can naturally draw them into your camera’s field of view.

Similar Species

Species that look similar or are commonly confused with Olive-sided Flycatcher.

Western Wood-Pewee

Smaller with a much thinner bill and lacks the high-contrast dark 'vest' on the sides of the breast.

Eastern Wood-Pewee

Features longer wings than most flycatchers but has a more uniform gray-olive wash across the chest rather than the 'vested' look.

Frequently Asked Questions

Olive-sided Flycatchers are most active during the early morning and late afternoon when flying insect activity is at its peak. You are most likely to hear their 'Quick, three beers!' call and see them hunting from high snags between 6:00 AM and 10:00 AM.

Unlike many songbirds, Olive-sided Flycatchers won't visit seed feeders. The best way to attract them is to maintain tall coniferous trees and, if safe, leave dead 'snags' standing, as these provide essential hunting perches. Creating a pollinator-friendly garden or a pond also helps by providing a steady supply of large flying insects.

Their diet consists almost entirely of flying insects. They are particularly fond of Hymenoptera (bees, wasps, and ants), but they also consume dragonflies, moths, and beetles which they catch mid-flight using an agile 'hawking' technique.

They are less common in dense suburban environments compared to wood-pewees. They prefer 'edge' habitats, so you are most likely to see them in suburban backyards that border large parks, forests, or recently cleared wooded lots with plenty of tall trees.

Look for the 'vest.' The Olive-sided Flycatcher has dark brownish-gray sides that contrast sharply with a white line down the center of the chest, whereas Wood-Pewees have a more uniform, dingy gray breast. The Olive-sided is also larger with a much heavier bill.

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