American Redstart (Setophaga ruticilla)
A medium-sized warbler with a relatively wide, flat bill and fairly long, expressive tail. In flight it has a deep chest, slim belly, and long, somewhat club-shaped tail.
American Redstarts are incredibly active insectivores that seem never to stand still. They rapidly spread their cocked tails, exposing the orange or yellow in a quick flash, which often startles insect prey into flushing, whereupon the redstart darts after it, attempting to catch it in the air.
Breed in open wooded habitats, particularly those dominated by deciduous trees. In migration, the species can be found in nearly any treed habitats. Its tropical winter habitat is in woodlands and open forest at lower and middle elevations.