If you hear an ascending "wheep" whistled from the treetops, a great crested flycatcher is nearby. As its name suggests, this large songbird is a pest controller. It eats not only flies, but also beetles, wasps, bees, crickets, moths and caterpillars, plus fruits, berries and, rarely, hummingbirds.

Great crested flycatchers breed in eastern North America but migrate toward Central and South America every fall. Typical nest sites are hardwood tree cavities near clearings, although they sometimes use bird boxes in suitable habitat.