Rizki, a orphaned Bornean orangutan, learns to bite at Surabaya Zoo on May 19, in Surabaya, Indonesia. Damai and the 10-month-old Rizki are brothers who were abandoned by their mother Dora shortly after birth. Zookeepers hand-reared the little orphans, clothing them in shirts and diapers, and feeding them milk and mashed banana. Now they are beginning to learn to live independently so that one day they may be released into the wild.
Robertus Pudyanto/Getty Images