Watch: Pair of rare leopard cubs romp at San Diego Zoo

A pair of rare Amur leopard cubs are now in their outdoor habitat at the recently-reopened San Diego Zoo. The two cubs born on April 26 are already showing natural behaviours of stalking and climbing. Amur leopards are the rarest of the big cat species on the planet. Fewer than 100 Amur leopards are believed to exist in their historic range in Russia and China.