Francine Schroeder snapped a shot of Smokey the Bear keeping cool from the heat and forest fires in his pool at the Zoo in 1976.
Jessie Cohen captured an image of baby Orangutans Bonnie (in the tub) and Azy, splashing in a bath at the Zoo in 1981.
A polar bear staying chilly by taking a dip in the Zoo pool.
E. Hardy caught the Alligators in action heading into the water to beat the heat at the Zoo's Reptile House in 1934.
Courtney Esposito, Institutional History Division, Smithsonian Institution Archives