[Sydney, March 24. Image via Getty.]

Primate keepers Louise Grossfeldt (L) and Mandy McLellan (R) display an infant Francois Langur (Trachypithecus francoisi) named 'Elke' through the window of Taronga Zoo's Wildlife Hospital in Sydney on March 24, 2009. There are only around 1,000 of the critically endangered leaf-eating monkeys still in the limestone karst region of northeast Vietnam. (TORSTEN BLACKWOOD/AFP/Getty Images)