A black rhinoceros calf stands with his mother at the Saint Louis Zoo in this undated handout photograph released to Reuters on January 25, 2011. The calf was born to first-time parents, mother Kati Rain and father Ajabu, at the Saint Louis Zoo on January 14, 2011. Weighing 120-1/2 pounds, the little male is nursing well and being cared for by his mother, according to zoo staff. This is the first black rhino calf to be born at the Saint Louis Zoo in 20 years. In all, eight black rhino calves have been born at the zoo. [Xinhua/Reuters]