The Collaborative International Dictionary of English v.0.48:

Canary bird \Ca*na"ry bird`\ (Zool.)
   A small singing bird of the Finch family (Serinus
   Canarius), a native of the Canary Islands. It was brought to
   Europe in the 16th century, and made a household pet. It
   generally has a yellowish body with the wings and tail
   greenish, but in its wild state it is more frequently of gray
   or brown color. It is sometimes called canary finch.
   [1913 Webster]

   Canary bird flower (Bot.), a climbing plant (Trop[ae]olum
      peregrinum) with canary-colored flowers of peculiar form;
      -- called also canary vine.
      [1913 Webster]

WordNet (r) 3.0 (2006):

canary bird
    n 1: any of several small Old World finches [syn: canary,
         canary bird]