Crocodiles can close their ears.

Crocodylus_acutus_mexico
An american crocodile (Crocodylus acutus). This photograph was taken at La Manzanilla, Jalisco State in Mexico, on the Pacific Coast. Image credit: Tomás Castelazo cc2.5

Crocodiles spend a lot of time in the water with just the top of their heads sticking out. Their eyes are located high on their heads to see around them but their ears are located a bit lower so they are covered with special flaps that the crocodile can close when underwater. This prevents water from going inside its ears. On land, it can open these ear flaps to hear better.

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