Did you know that giraffes are the tallest
animals in the world? They are unique in other
ways, too. For one thing, they sleep only
about 20 minutes each day, and usually not
more than five minutes at a time. (They have
to remain alert for predators.) Also, every
giraffe's coat is unique, and varies in color
from white to nearly black, depending on
what they eat and where they live.
The main idea of this passage is:
A. Giraffes don't sleep very much.
B. Giraffes are unique animals.
C. There are many animals in the world.
D. No animal is taller than a giraffe.