Hey, we had a whole thread of double-dactyls a couple of years ago. If the search engine were any good, I'd find it for you.

Wait - it worked! Here's one of the threads:

http://wordsmith.org/board/showthreaded.pl?Cat=&Board=wordplay&Number=105694&page=&view=&sb=&vc=1#Post105694

Now where I come from, "giving up the sheep" has a whole nother meaning ...