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Two clouded snow leopards, a girl and boy, were born at the Denver Zoo on March 14, the zoo announced Thursday.
The unnamed cubs are the first of their species born at the zoo, according to a news release.
The cubs' mother, Lisu, gave birth to the pair in a private stall. Lisu did not tend to the cubs, however, and zookeepers moved them to another building to provide for their care. Zookeepers believe because first-time mother Lisu was hand-raised, she "lacks the experience to rear her own cubs," according to the release.
These are the first cubs for Lisu and her mate, Taji.
Clouded leopards can be found in the wild in Southeast Asia in southern China, parts of Nepal, India, Burma and from Indochina to Sumatra and Borneo, the release said. While exact numbers of their population are not known, it is believed they are in decline.
The Denver Zoo cubs will "remain behind-the-scenes until they grow older," the zoo said.