I've thought of quite a few more myself. There seem to be many of these metaphors. It's interesting that there seem to be so many for birds. Maybe we'll really get to 100.
Cock of the Walk
Early Bird
Firebug
Homing Pigeon
Old Coot
Snake in the Grass
Watchdog
Wise Old Owl
Edit: And I just rememebered 'early bird'!
[This message has been edited by Baron Munchausen (edited 27 August 2001).]