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Why so many animals have a third eyelid, including our pets – yet humans don’t

By Dan Baumgardt, Senior Lecturer, School of Physiology, Pharmacology and Neuroscience, University of Bristol
Our family dog used to have a rather noticeable extra eyelid that became especially apparent when he dozed off, usually upturned on the rug. This is the fleshy curtain seen at the corner of each eye, closest to the nose. It’s also commonly called the nictitating (literally “blinking”) membrane.

You may have noticed these “third” eyelids on your pets appear occasionally, perhaps during their sleepy moments, or when they’re enjoying a bit of affection. But what does this unusual structure actually do? And why don’t…The Conversation

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