Prairies may be tropical or temperate. They are also very powerful. They like to gather where there are few trees. Of course there are not that many trees on the prairie, either. Cowbirds enjoy sitting on bison heads.
Some people call bison buffalo.
The French called them cows and oxen. This is partly right, but not the same. Bison have close ties to people. People shared the prairie with them, and they considered the bison their brothers. Well, I could not.