MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
The white rhino (Ceratotherium simum) is an animal of the African plains and savannahs. Its wide mouth has evolved to mow grasses. They prefer to drink at least once a day and can drink up to 50 litres at a time but the average is 12 litres a day. The penis faces posteriorly and, while sub-adult and subordinate bulls urinate normally, a territorial bull urinates a powerful spray to define boundary markers. Urine may have a milky appearance. During mating the penis is re-directed into the conventional forward position. Hippos are also retromingent - urinate backwards - but as they are not closely related it is an example of convergent evolution. Photographed inLille zoological park, France.
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