Three weeks after the birth of a giant panda cub, San Diego Zoo veterinarians have determined it’s a girl, in photo release on August 24, 2005. The female cub weighs 22 ounces and is 29.5 centimeters from the tip of its nose to the base of its tail. As Chinese tradition dictates, naming the cub will not occur until the cub is 100 days old. The San Diego Zoo now has the largest population of the critically endangered giant pandas outside of mainland China. The Zoo has four pandas. It is estimated there are only about 1,600 giant pandas in the world. (UPI Photo/Ken Bohn/San Diego Zoo)