In this photo provided the Columbus Zoo and Aquarium female African lion cub Adia chews on grass, Monday, Nov. 23, 2009 in Columbus, Ohio. Adia, a brother and a sister, all born Sept. 22, were allowed outdoors in view of zoo visitors for the first time on Tuesday, Nov. 24. (AP Photo/Columbus Zoo and Aquarium)

In this photo provided the Columbus Zoo and Aquarium female African lion cub Adia chews on grass, Monday, Nov. 23, 2009 in Columbus, Ohio. Adia, a brother and a sister, all born Sept. 22, were allowed outdoors in view of zoo visitors for the first time on Tuesday, Nov. 24. (AP Photo/Columbus Zoo and Aquarium)