any bird with a sharply curved bill resembling a sickle, as a curlew or thrasher
See sicklebill in American Heritage Dictionary 4
(sĭkˈəl-bĭlˌ)
noun
Any of several birds having long sharply curved bills, as Falculea palliata, a passerine bird of Madagascar, and Hemignathus procerus, a Hawaiian honeycreeper.