May fowl

from The Collaborative International Dictionary of English v.0.48

Maybird \May"bird`\, n. (Zool.)
   (a) The whimbrel; -- called also {May fowl}, {May curlew},
       and {May whaap}.
   (b) The knot. [Southern U. S.]
   (c) The bobolink.
       [1913 Webster]