Camels Have Three Eyelids
Camels have three eyelids. Two of the eyelids have eye lashes which help protect their eyes from sand. The third is a very thin lid which works as a sort of “windshield wiper” to clean off their eyes. It closes/opens from side to side rather than up and down. It is also thin enough that the Camels can see through it somewhat. So in a sandstorm or otherwise windy day where sand is being stirred up, they can close that lid to protect their eyes from the sand, but still see where they are going.
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Far more than just camels!
http://en.wikipedia.org/wiki/Nictitating_membrane
“Some reptiles, birds, and sharks have full nictitating membranes; in many mammals, a small, vestigial portion of the membrane remains in the corner of the eye. Some mammals, such as camels, polar bears, seals, and aardvarks, have full nictitating membranes.
Fully developed nictitating membranes are found in birds, reptiles, amphibians, fish, and mammals, but are rare in primates.”
Do camels live in the snow?
yes,, yes they do. Snow camels