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This photo provided by the Smithsonian Institution shows two male clouded leopard cubs that were born Feb. 14, 2010 at the National Zoo's zoo's Smithsonian Conservation Biology Institute in Front Royal in Virginia.
Published: May 6, 2010 3:00 a.m.
Vulnerable and adorable
On Wednesday, zoo officials said the cubs have been growing steadily and now weigh more than 4 pounds.
They weighed just a half-pound at birth.
Clouded leopards are considered "vulnerable to extinction."