Geoff's inspired double-pun about Brewster the Rooster put in mind the familiar simile, "as cocky as a rooster".

There must be many more animal similes of that sort, but none pop to mind immediately -- or at least not to my mind. Who can take that ball and run with it?

WARNING: somewhat blue ahead
Also puts me in mind of a non-word-related joke heard today:
Q: How many animals does a woman need in her life?
A: Four: A mink for her back; a jaguar for her garage; a tiger for her bedroom; and a jackass to pay for it all.