pi·geon 1 
(pĭjən)
(pĭjən)n.
1. Any of various birds of the widely distributed family Columbidae, characteristically having plump bodies, small heads, and short legs, especially the rock pigeon or any of its domesticated varieties.
2. Slang One who is easily swindled; a dupe.
[Middle English, from Old French pijon, probably from Vulgar Latin *pībiō, pībiōn-, alteration of Late Latin pīpiō, young chirping bird, squab, from pīpīre, to chirp.]