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Nictitating membrane

Nictitating membrane - Picture 3 in Owl Physiology: Vision - Long-eared Owl (Asio otus) with nictitating membrane partially over one eye. First photo is eye in normal state.

 

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Long-eared Owl (Asio otus) with nictitating membrane partially over one eye. First photo is eye in normal state.

Photographer: Radoslaw Gwozdz  © Copyright

 
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