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]WordNet (r) 3.0 (2006):
birdwatch v 1: watch and study birds in their natural habitat [syn: bird, birdwatch]