Denver Zoo is celebrating the birth of two clouded leopard cubs which were born March 14, the first births of their species at the Zoo. The unnamed cubs, a male and a female, are doing well now after zookeepers began steps to hand-raise them. Their mother, Lisu (LEE-soo), gave birth to the cubs in a private birthing stall inside Toyota Elephant Passage, but did not then tend to them. Zookeepers believe this is because first time mother Lisu was hand-raised herself and lacks the experience to rear her own cubs. After a few hours, zookeepers moved the cubs to another building and began a protocol to provide food and medicine every three hours for the time being. The cubs will remain behind-the-scenes until they grow older. Check out the video!