Smithsonian's Clouded Leopard Cubs Are Growing, Adorable (PHOTOS)

WASHINGTON -- The clouded leopard cubs born two months ago at the Smithsonian's Conservation Biology Institute in Front Royal, Va. are healthy, growing and still adorable.

How adorable? They won't be on display while in Front Royal so you can't see them in person (or in cat, as it were) -- but you can check out their progress in these photos that the National Zoo posted to Facebook this week:

The zoo gave a report on the leopards' progress, as well:

Keepers report that the cubs spend most of their time playing and like to climb as high as they can! They’ve also mastered eating solid foods and are steadily gaining weight. Our male cub weighs just over 4.5 pounds, and our female weighs about 3.5 pounds.

These cuties will stay at the in Front Royal for the next six weeks. Once the animals are three and a half months old they'll be moved to a Species Survival Plan chosen zoo.

The SCBI has bred more than 70 leopards over the last 30 years. Clouded leopards are listed as "vulnerable" on the IUCN’s Red List of Threatened Species. Due to hunting and deforestation in Southeast Asia, there are thought to be fewer than 10,000 of these animals, said to have an "arboreal lifestyle," in the wild.

This is the second litter for mother Sita and father Ta Moon, who had another set of twins in 2011.

Ta Moon, born in March 2009, was the first clouded leopard cub born at the Smithsonian Conservation Biology Institute.

And, because we can't get enough of these clouded leopards, here's what the the babies looked like back in February: