Today, the Greater Yellowstone Area is home to
approximately 75 gray wolf packs.
W
olves are a keystone
species
. This
means they have a large effect on
their
ecosystem
. Throughout the years,
scientists have studied the effect of
wolves in Yellowstone National Park. In
the 1920s, the US government removed
gray wolves from the park. Many people
wanted to remove wolves from the West.
A HEALTHY
ECOSYSTEM
CHAPTER 2
11
