Watch: Pair of rare leopard cubs romp at 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.

San Diego: A pair of rare Amur leopard cubs are now in their outdoor habitat at the recently-reopened San Diego Zoo.

The two cubs were born April 26 and have not yet been named. They are the second litter for their mother, Satka, who keeps an eye on them as they explore and play.

"The cubs are climbing up on the rocks, they are getting into the trees, sometimes listening to mom and sometimes not listening to mom," said Kelly Murphy, senior wildlife care specialist, San Diego Zoo.

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The cubs 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.

(AP)