willow flycatcher

alder flycatcher

noun
  1. a North American flycatcher, Empidonax alnorum, of alder thickets and other moist areas, that has greenish-brown upper parts and whitish underparts and is almost indistinguishable except by voice from E. traillii (willow flycatcher).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018