The olive-sided flycatcher is an impressive aerial acrobat. During courtship, pairs gracefully ‘dance’ together in a series of synchronized downward swoops. The female solicits copulation by sitting next to the male on a branch and by fluttering the half-open wings. Olive-sided flycatcher pairs are monogamous, and produce three to four eggs each nesting season. The nest is an open cup built on a horizontal branch of a coniferous tree, well out from the trunk. As in other members of the “tyrant” group of flycatchers (Tyrannidae), the olive-sided flycatcher pair aggressively defend a territory, which can sometimes extend for up to 40 to 45 hectares around the nest. The female olive-sided flycatcher incubates the eggs for 15 to 19 days, while the male brings food (2).
The olive-sided flycatcher preys almost exclusively on flying insects, such as bees, wasps, grasshoppers and dragonflies. It catches its prey in the air by quickly swooping from a perch at the top of a tall tree (2) (3).