Snakes have infamously poor eyesight, but for at least one species there is a way to improve their vision in a pinch.
via Discovery News http://news.discovery.com/animals/snakes-control-blood-flow-to-boost-vision-131111.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/animals/snakes-control-blood-flow-to-boost-vision-131111.htm#mkcpgn=rssnws1
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