The Collaborative International Dictionary of English v.0.48:

Shoebill \Shoe"bill`\, n. (Zool.)
   A large African wading bird (Balaeniceps rex) allied to the
   storks and herons, and remarkable for its enormous broad
   swollen bill. It inhabits the valley of the White Nile. See
   Illust. (l.) of Beak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Balaeniceps rex
    n 1: large stork-like bird of the valley of the White Nile with
         a broad bill suggesting a wooden shoe [syn: shoebill,
         shoebird, Balaeniceps rex]