Sub-adult male white rhinoceros urinating

Sub-adult male white rhinoceros urinating

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: 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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Keywords: africa, african, animal, biological, biology, ceratotherium simum, endangered species, fauna, france, grazer, lille zoo, mammal, monogastric, nature, odd-toed ungulate, peeing, penis, retromingent, rostrum, spray, sub-mature, territory, urinate backwards, urinating, urine, weeing, white rhinoceros, wide mouth, wildlife, zoological, zoology

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