Eastern Wood Pewee, Contopus virens
In eastern woods in summer, the plaintive whistled “pee-a-wee” of this small flycatcher is often heard before the bird is seen. The bird itself is usually somewhere in the leafy middle story of the trees, perched on a bare twig, darting out to catch passing insects. The Wood-Pewee sings most often at dawn and dusk, and it may continue singing quite late in the evening, after most songbirds have fallen silent. (Audubon Guide to North American Birds)
The Way 