Snakes can temporarily improve their eyesight by constricting blood flow

11/7/2013 | LiveScience.com

Snakes, which are known to have poor eyesight, can control blood flow to their eyes to improve vision when threatened, according to a study outlined in the Journal of Experimental Biology. Researchers looked at the diaphanous layer of skin that covers a snake's eyes, noting a network of blood vessels that constricted and expanded consistently when the snake was at rest. But when feeling threatened, the snake constricts the vessels for several minutes to give them the clearest sight possible to defend itself, researchers say.

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