Paul Stenquist wrote:
is not like the other: http://photo.net/photodb/photo?photo_id=18328619&size=lg Male and female house sparrows
I'd comment on it being a nice photo, but that's probably getting a bit repetitive by now.
Sometime in the past week I heard (possibly on NPR, possibly folks chatting at a party) that even birds that look isomorphic to us are actually sexually dimorphic, it's just that their coloration differs in colors/frequency bands that we can't see since (many?) birds are tetrachromats with UV receptors.
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