The Collaborative International Dictionary of English v.0.48:

Corncrake \Corn"crake`\ (k[^o]rn"kr[=a]k`), n. (Zool.)
   A bird (Crex crex or Crex pratensis) which frequents
   grain fields; the European crake or land rail; -- called also
   corn bird.
   [1913 Webster]