A few nice free animals images I found:
Image by gogoloopie
My second cousin in-flight. :)
ZooLights is FREE at the National Zoo!
Image by Smithsonian's National Zoo
See the Zoo in a whole new light! This year, as a holiday gift to the city, Friends of the National Zoo announces ZooLights is free!
Create memories with loved ones while enjoying thousands of environmentally-friendly light and animal exhibits, entertainment, and a special train ride for children. Visitors can thaw their paws in our animal houses while attending special keeper talks, or stop by the Visitor Center to see the Zoo-themed model trains and the gingerbread habitat contest entries on display in the auditorium. Of course, the crown jewels of ZooLights are the dozens of animal light displays, including a new display featuring Andean bears.
Photo by: Mehgan Murphy, Smithsonian's National Zoo