Buffalo graze at Custer State Park. The park is home to more than 1,300 buffalo.
The donkeys in the park often approach vehicles passing through Wildlife Loop Road. They seem to expect handouts, so have a snack ready if you roll down your window.
Before the arrival of European settlers, millions of buffalo migrated through the Great Plains. They were nearly hunted to extinction in the 1890s. Today, there are more than 200,000 in North America.