In Our Backyard: Olive-sided Flycatcher
A Summer Songster of Thompson-Nicola Forests
The Thompson-Nicola region serves as a seasonal haven for one of North America’s most charismatic songbirds: the Olive-sided Flycatcher (Contopus cooperi). Recognizable by its bold, upright posture and distinctive “quick-three-beers!” call, this aerial insectivore thrives in the region’s diverse forested landscapes. It often perches atop tall snags in open forest edges and recently disturbed areas, from where it sallies forth to capture flying insects.
A member of the tyrant flycatcher family, the Olive-sided Flycatcher is larger than most of its relatives. It has dusky olive-grey plumage, white underparts, and dark vested flanks, giving it a tailored appearance. Most often spotted at the very tops of trees or dead snags, it is an unmistakable figure in the summer landscape—and often heard before it’s seen.
Distribution
During the breeding season, Olive-sided Flycatchers are found throughout the Thompson-Nicola region. They favour open habitats with tall trees and snags, including wetland edges, recently logged areas, or post-wildfire forests. These habitats offer elevated perches for hunting and abundant insect prey. The region’s biogeoclimatic diversity, especially areas within the Ponderosa Pine and Interior Douglas-fir zones, provides excellent nesting and foraging conditions for the species.
The Olive-sided Flycatcher migrates long distances each year, spending the winter in Central and South American tropical forests. In the Thompson-Nicola, their presence spans from late May through August, offering a brief but ecologically valuable contribution to the summer bird community.
Threats
The Olive-sided Flycatcher was listed as Threatened under Canada’s Species at Risk Act, with populations having declined by more than 70% since the 1970s. As of its most recent assessment by COSEWIC (April 2018), the olive‑sided flycatcher has been classified as Special Concern in Canada. This reflects that although its rate of decline has slowed since the earlier Threatened designation in 2007, the species continues to warrant conservation attention due to its ongoing population decreases. In British Columbia the olive‑sided flycatcher is considered relatively secure (S4B) although it still benefits from habitat protection and monitoring.
In the Thompson-Nicola region, habitat loss and degradation represent the most pressing threats. Forestry practices that remove tall snags or simplify forest structure can eliminate suitable breeding and foraging habitats. Urban expansion and infrastructure development also contribute to the fragmentation of critical nesting areas.
The suppression of natural wildfire regimes has reduced the availability of post-fire forests—one of the bird’s preferred habitats. Historically, low-intensity wildfires helped maintain a mosaic of open forest with standing dead trees, but fire suppression policies have disrupted this cycle. Additionally, widespread pesticide use in both agricultural and forested landscapes may reduce insect abundance, undermining the food base that supports breeding success. Climate change poses an overarching threat by altering local weather patterns and affecting habitat conditions across both breeding and migratory ranges.
Conservation
Effective conservation for the Olive-sided Flycatcher in Thompson-Nicola requires protecting and managing its preferred habitats. This includes maintaining forested landscapes with tall snags and open canopy structures, especially in areas influenced by fire or logging. Sustainable forestry practices that retain structural diversity and allow for natural regeneration can help create suitable breeding conditions.
Reintroducing or allowing low-intensity fires where appropriate can also support the re-establishment of open forest habitats. Reducing pesticide use and protecting insect-rich wetlands and forest edges will further benefit foraging opportunities. Continued monitoring, including community science participation through programs like eBird, is essential for tracking population trends and informing adaptive management strategies.
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Feature photo: Michael Klotz, licensed under the terms CC-by-NC 2.0