Black and White Sight
Why do some animals see in black and White?
In the animal kingdom, sight is accomplished by using either rods or cones
on the retina of the eye. Animals that see black and white and shades of
gray have only the rods in their retina. Animals that see color have both
rods and cones; the cones are for color, but require a lot more light to
stimulate. The bottom line is that animals that see color are diurnal
[daylight] and black and white vision is for nocturnal [night] vision. If
an animal does not see color, it is adapted to night vision.
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Update: June 2012