<p>To my knowledge, neither my undergraduate nor graduate schools had a mascot. I’d have to go back to HS, where we were Rams. H was a Battling Bishop, a Hornet, and a Spartan, and ultimately a Bobcat/Violet. (He went to a lot of schools! I had to google. 
Edit: Google also reveals that the U of C apparently does have a mascot: the Phoenix. Who knew? Judging by the comments, hardly anyone.)</p>
<p>S is another Big Green. We participated with a friend in a trivia contest in which the teams give themselves funny–usually salacious–names on the night before we took him off to college, and the friend named our team the Anthropomorphic Kegheads in his honor.</p>