The Collaborative International Dictionary of English v.0.48:

Bobolink \Bob"o*link`\, n. (Zool.)
   An American singing bird (Dolichonyx oryzivorus). The male
   is black and white; the female is brown; -- called also,
   ricebird, reedbird, and Boblincoln.
   [1913 Webster]

         The happiest bird of our spring is the bobolink. --W.
                                                  Irving.
   [1913 Webster] Bobsled

WordNet (r) 3.0 (2006):

bobolink
    n 1: migratory American songbird [syn: bobolink, ricebird,
         reedbird, Dolichonyx oryzivorus]