Rasping mouthparts from fish also cleans the hippo's hide, toenails, the cracked feet and butt. Others cover the bristles of its tail. A whole community of fish functioning as hippo cleaners ...
Hippos have fingernail-like hooves on their webbed feet. Two-month-old pygmy hippo Moo Deng with her keeper at Khao Kheow Open Zoo. (Photo by Carola ... [+] Frentzen/picture alliance via Getty ...
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