Dean Daringer, age 10, of North Brunswick, New Jersey, for his question:

Are all animals color blind?

Some of the animals see the world in gorgeous colors, as we do. Others see the scenery in black, white and shades of grey. You would expect the advanced mammals, such as cats and dogs to have color vision. But they don't neither do the monkeys, the cows or the pigs. The cheerful frogs also seem to be color blind. So are the salamanders and the toads.

There are a million or so different animals in the world and only a few of them have been tested for color vision. What's more, it is nor easy to test an animal's eyesight. So far, scientists have found out that many fishes see colors, so does the octopus and the squid. Birds also see colors, at least those that are busy during the daytime. And some of the insects are able to see colors that we cannot.