Heidi, A female Bactrian camel, born on March 21 weighing 61 pounds, sits next to her mother at the St. Louis Zoo in St. Louis on April 20, 2006. (UPI Photo/Bill Greenblatt)
A male elephant calf, born today, is under the vigilant care of his mother, Umngani, at the San Diego Zoo on March 13, 2009. (UPI Photo/Ken Bohn/San Diego Zoo)
Nokopo, a female Matschie's tree kangaroo joey, pokes her head out from within her mother Kasbeth's pouch at their habitat in Emerson Children's Zoo at the Saint Louis Zoo in St. Louis on December 17, 2010. UPI/Bill Greenblatt