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Scientists think that most animals can’t see colors. The world is black and white to them.

To find out if dogs could see colors, scientists gave dogs food every time they played a certain piece of music. The dogs got ready to eat only when they heard this piece of music. They did not get ready to eat when they heard other pieces of music.

Then the scientists gave the dogs food every time they showed them a certain color. The dogs got ready to eat when they saw this color. The scientists then showed the dogs another color. Again the dogs got ready to eat. The colors were all the same to them.

Colors are not all the same to monkeys, however, for example, if we put food in a red box and do this every day, a monkey will always go to the red box to get the food. If we then put food in a blue box, the monkey won’t go to it.

1.All colors are the same to ___________.

A. dogs B. monkeys C. scientists D. all animals

2.Monkeys know that red and blue are __________________.

A. colors B. not the same C. food D. music

3.The scientists give the dogs food every time they _____________.

A. played certain music B. saw the color red

C. saw the color blue D. went to a box of food

4.Dogs are different from monkeys because _________________.

A. dogs can’t see any colors and monkeys can

B. monkeys can’t see any colors and dogs can

C. dogs can’t see more colors than monkeys

D. monkeys can’t see red and blue

5.Some ___________ wanted to find out if dogs could see colors.

A. animals B. monkeys C. doctors D. scientists

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Description: Black body and head, brown nose, and large ears that stick out

•Size: 150 to 600 pounds, 4.5 to 6.5 feet long

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