PETER CHADWICK / SCIENCE PHOTO LIBRARY PETER CHADWICK / SCIENCE PHOTO LIBRARY
White rhinoceros (Ceratotherium simum) that has been dehorned. The white rhinoceros is the second largest land animal after the elephant, weighing up to 3600 kilograms. The rhinoceros has two horns, one in front of the other, with the front horn being the largest. The horns are made of solid keratin and grow continuously. In Asia its horn is thought to be an aphrodisiac. This has lead to extensive poaching, which very nearly caused extinction at the end of the nineteenth century. To try to deter poachers game keepers sometimes cut off the rhinos horn, although this has limited success due the the horns' regrowth. Photographed in Zambia.
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