We usually go see the Denver Zoo at night because they put up some really cool Christmas Lights. The exhibit is called Denver Zoo Lights. This year, however, it was very balmy in Denver, in the 50s, so we decided to go by the zoo during the day. Glad we did since we were able to see most of the animals we miss when we go at night.
If you ever get a chance to go in the day or at night during Zoo Lights, I highly recommend it.