ornithologist

from WordNet (r) 3.0 (2006)

ornithologist
    n 1: a zoologist who studies birds [syn: {ornithologist}, {bird
         watcher}]

from The Collaborative International Dictionary of English v.0.48

Ornithologist \Or`ni*thol"o*gist\, n. [Cf. F. ornithologiste.]
   One skilled in ornithology; a student of ornithology; one who
   describes birds.
   [1913 Webster]