It looks like you have already thought about
this. You are right that some people are called
"color blind," but most of these people can
see some colors, and not others. A lot of men and
boys have trouble telling the difference between
red and green. My cousin can't tell the
difference between dark red and black. So not
everyone sees colors the same, but it can be hard
to tell when someone can't see color.
In kindergarten or first grade, most of us
learned the color names. Maybe you and I learned
to call a certain color "green" but we may have
actually "seen" different colors.
Lots of animals don't see color the way we do.
That's because they have eyes that are adapted
for seeing at night. What animals are out at
night? These are nocturnal animals. They
probably see little or no color. Why would
some animals need to see color?
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