houses more than 10,000 animals on 12,000 acres. It's also the part-time home of beloved wildlife guru Jack Hanna, the zoo's director emeritus. Now, Nat Geo Wild is taking viewers inside the ...

Mission Critical on August 28 at 8 p.m. ET on Nat Geo WILD to follow their development at three breeding centers. I crouch down low in the grass to get a closer look at the animal lurching toward me.