The nestling period has not been determined accurately because young birds remain near the nest after leaving. Female incubates her eggs while the male gathers food for her. The Olive-sided Flycatcher (Contopus cooperi (Swainson), French: Moucherolle à côtés olive) is a medium-sized songbird 18-20 cm in length. The Olive-sided Flycatcher eats flying insects. Olive-sided Flycatchers arrive on their Canadian breeding Females incubate three to four eggs for about 15 days. The wings are dark with pale, indistinct wing bars, and the bill is stout. Lifecycle. Adults are a deep brownish olive-grey above and on the sides and flanks, with white on the throat, centre of breast and belly. Olive-sided Flycatcher. In Oregon, a Gray Jay was observed taking two Olive-sided Flycatcher eggs (Altman and Sallabanks 2012). COSEWIC Status: Threatened . General prohibitions under the Migratory Birds Convention Act (1994) and its regulations protect Olive-sided Flycatcher nests and eggs anywhere they are found in Canada, regardless of land ownership. The Olive-sided Flycatcher leaves the Northwest Territories in late July to early August and winters in South and Central America. Olive Sided Flycatcher Eggs. COSSARO Status: Special Concern . The Olive-sided Flycatcher arrives in the Northwest Territories in late May and early June. After hatching, both male and the female feed the young. Committee on the Status of Endangered Wildlife in Canada × The committee on the Status of Endangered Wildlife in Canada is a committee of experts who determine the national status of native species thought to be at risk of disappearing from Canada. The female usually lays three eggs in a shallow open cup nest on a horizontal tree branch. Both parents feed the young birds. The family stays together till the migration in fall. The egg and nestling stages in Canada can last from late May/mid-June to early/mid-August, depending on latitude. Contopus cooperi. Of all the flycatcher species that breed in the United States, the olive-sided flycatcher has the longest migration. Olive-sided flycatcher is a rare host for Brown-headed Cowbird. Robertson and Hutto (2007) suspect that increased predation was the primary cause for significantly reduced breeding success in thinned versus burned forest; Red Squirrel Olive-sided Flycatcher is an aerial insectivore, generally making short foraging flights from a high perch to intercept flying insects. Nevertheless, nests and eggs can be inadvertently harmed or disturbed as a result of many activities, including but not limited to clearing trees. She incubates them for 10-17 days. The female lays 3 eggs, rarely 2 or 4, smooth, lusterless, creamy white to light buff eggs(see Harrison [1979] for photo of markings). Migration. The male defends a large area around the nesting territory. Both sexes aggressively defend the nest area, attacking both potential predators and human intruders. After leaving the nest, the young ones continue to depend on the parents for about a week. The young ones are ready for their first flight at about 21-23 days.