Frederique Olivier / Hippopotamus (Hippopotamus amphibius) at surface, closes its nostrils and submerging, Serengeti NP, Tanzania.
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Frederique Olivier / Hippopotamus (Hippopotamus amphibius) at surface, opens and closes its nostrils before submerging, Serengeti NP, Tanzania.
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Frederique Olivier / Group of Hippopotamus (Hippopotamus amphibius) wallowing in a pool, resting, with nostrils opening and closing, Serengeti NP, Tanzania.
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Frederique Olivier / African lioness (Panthera leo) with a torn nostril looking around, Serengeti NP, Tanzania.
