I've been reading a book about the industry of horseshoe crab lysate. Horseshoe crabs see in the moonlight to find their mates. They can actually see better at night than during the day - one article I read said that the better vision is triggered by an internal clock, not the light level. That is too bad as I found the idea of good moonlight vision quite compelling.
See how interesting the horseshoe crab is!
http://www.horseshoecrab.org/anat/vision.html
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