Read the passage.
Bison or Buffalo?
Bison and buffalo belong to the Bovidae, or cattle, family, but they are different species
and have distinct characteristics. Many people refer to the creatures that once roamed
the American West as buffalo; however, these animals are actually American bison, and
they are only found in North America. On the other hand, two species of buffalo-the
cape buffalo and the water buffalo-are found in Africa and Asia, respectively. Unlike the
American bison, which has short horns similar to those of cows, buffalo have broad,
sweeping horns. In addition, the American bison has a broad head carried low and a
massive hump at the shoulders. In contrast, buffalo don't have shoulder humps and their
heads are smaller than the bison's.
What is the main idea of the passage?
Buffalo and American bison are both members of the Bovidae family.

American bison are often mistakenly called buffalo, but the two creatures are
quite different

American bison can be distinguished from buffalo by the size and shape of
their horns.