Olive-sided Flycatcher Contopus borealis Swainson       Field Guide IDs: NG-286; G-216; PE-196; PW-pl 42; AE-pl 470; AW-pl 547; AM(II)-252 Nest Location Nest Type Eggs & Mating System Dev. & Parental Care Primary & 2ndary Diet.. Foraging Strategy F I: 14 DAYS ALTRICIAL 5 feet - 75 feet F? 3 (3-4) MONOG F: 21-23 DAYS MF BREEDING: Open montane and boreal coniferous and coniferous-deciduous forests, esp with abundant dead trees. ? broods. DISPLAYS: Males pursue females in courtship chase. NEST: Often high in conifer (deciduous in some areas) tree, on horizontal branch, far from trunk; compact, firmly attached with cobwebs; of twigs, rootlets, lichen, pine needles, most lined with lichen, grass, rootlets. EGGS: White, buff, pale salmon, lightly but clearly marked (often wreathed) with browns, olive. 0.8 (22 mm). DIET: Exclusively insects that can be captured in air; many honeybees. CONSERVATION: Winters in montane S.A. from Colombia and Venezuela s to s e Peru. Rare cowbird host. NOTES: Vigorous defender of nest area against potential predators including humans. Usu seen on exposed perch at top of or high in tree. STANFORD. NOTES: ESSAYS: Territoriality; Bathing and Dusting; Incubation: Heating Eggs. REFERENCES: Godfrey, 1986.