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Platypuses have two eyelids for protection. One is used the same way as humans use theirs, to help moisten the eyeball, but the other one is used for protection specifically when the platypus is hunting underwater. Platypuses close their eyes underwater and the second eyelid helps protect the platypus's eyes from sediments they stir up as they shovel in the mud for invertebrates and crustaceans.
Wiki User
∙ 10y ago
Wiki User
∙ 12y agoThey have an outer, opaque eyelid like yours and mine, which closes horizontally and helps moisten their eyeballs, like ours do.
Then they have an inner, more transparent eyelid that closes vertically, which helps protect their eyeballs from the sediment in the water while they are swimming.
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