A chimp motions for Santa to deliver his gift during Lion Country Safari's annual Christmas with the Chimps on Thursday, December 20, 2012. (Photo by Bruce R. Bennett/The Palm Beach Post)

A new species of monkey found in the Democratic Republic of the Congo and identified as Lesula (Cercopithecus lomamiensis) is seen in this undated photograph from an article published September 12, 2012 in the science journal PLOS One. The monkey was first seen in 2007 by researchers John and Terese Hart of the Peabody Museum of Natural History at Yale Research Project. The finding of C. lomamiensis represents only the second new species of African monkey to be discovered in the past 28 years, according to the research article. (Photo by Hart J. A., Detwiler K. M., Gilbert C. C./Reuters)

British captain A. Gatti and two pygmies with a 500lb gorilla strung from a pole, which the captain shot in the Tchibinda forest in the Lake Kivu region, Democratic Republic of the Congo, circa 1930. (Photo by General Photographic Agency). P.S. All pictures are presented in high resolution.

A shoebill is displayed at Ueno Zoo in Tokyo August 28, 2012. (Photo by Itsuo Inouye/Associated Press)

An elephant from Earl's Court Circus with a man in its mouth, 1928. P.S. All pictures are presented in high resolution.

A hen, a dog and a rabbit playing cards, circa 1956. (Photo by Evans/Three Lions)

Sebastien Laurent, manager of the Zoo, gives a slice of cake to Major, the holdest captive Orang-Outang in the world, as part of its 50th birthday ceremony, on July 17, 2012, at the La Boissiere-du-Doree Zoo near Nantes, western France. (Photo by Alain Jocard/AFP Photo)