swamp-warbler

from The Century Dictionary.

• noun One of several small sylvicoline birds of the United States, inhabiting shrubbery and tangle in swampy places, as the prothonotary warbler, Protonotaria citrea, the worm-eating warbler, Helmintherus vermivorus, and some related species, formerly all referred to Audubon's genus Helinaia (or Helonæa), the type of which is Swainson's warbler, H. swainsoni. See cuts under prothonotary and Helminthophaga.