The Collaborative International Dictionary of English v.0.48:

Curvirostres \Cur"vi*ros"tres\ (-r?s"tr?z), n. pl. [NL., fr. L.
   curvus curved + rostrum beak, rostrum.] (Zool.)
   A group of passerine birds, including the creepers and
   nuthatches.
   [1913 Webster]