The Collaborative International Dictionary of English v.0.48:

Carpintero \Car`pin*te"ro\ (k[aum]r`p[-e]n*t[asl]"r[-o]), n.
   [Sp., a carpenter, a woodpecker.]
   A california woodpecker (Melanerpes formicivorus), noted
   for its habit of inserting acorns in holes which it drills in
   trees. The acorns become infested by insect larv[ae], which,
   when grown, are extracted for food by the bird.
   [1913 Webster]