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Not for print or poster uses .Jerboa (Jaculus sp.), coloured X-ray. Jerboas are nocturnal desert rodents found throughout Northern Africa and Asia. They hop on their hind legs in a similar manner to kangaroos. They mostly eat soft seeds, grasses and sometimes insects. (KEYSTONE/SCIENCE PHOTO LIBRARY/ARIE VAN 'T RIET/SCIENCE PHOTO LIBRARY)