birdwatch

from WordNet (r) 3.0 (2006)

birdwatch
    v 1: watch and study birds in their natural habitat [syn:
         {bird}, {birdwatch}]

from The Collaborative International Dictionary of English v.0.48

Birdwatch \Bird"watch`\ (b[~e]rd"w[o^]ch`), v.
   to watch birds, especially in their natural habitats, for
   enjoyment or as a hobby; to {bird[3]}.
   [PJC]