Two leopard cubs are the newest additions at the Pittsburgh Zoo and PPG Aquarium.

Zoo officials said the cubs were born to clouded leopards Saya and Pi in November.

They thought Saya might be close to delivering when they saw her going in and out of the nesting box and staying longer.

Sure enough, keepers later spotted two cute cubs.

Mom, Saya, left the cubs after they had trouble latching, so zoo workers are bottle feeding them every four hours.

They are gaining weight, their eyes are starting to open, and they are becoming a little more curious.

The new cubs will remain at the animal care center for several more weeks before they move to their home in the islands area of the zoo.