• Wind Cave National Park - Two Worlds

    Wind Cave

    National Park South Dakota

Wildflowers - Canada Thistle

Canada Thistle - Circium arvense
Canada Thistle - Circium arvense
NPS Photo by Jim Pisarowicz
Canada Thistle is a noxious weed that the park actively works to limit its spread.

Did You Know?

American bison on the Wind Cave National Park prairie

The American bison is the largest terrestrial mammal in North America. Male bison can weigh a ton and can run 35 miles per hour. Do not approach bison. They weigh more and can outrun you. More...