Hayden Valley is dominated widely by buffalo, along with other deer such as white-tails and elk. But it's the buffalo make their mark on this grassy valley; very grassy. It's a great expanse of even, green-studded plains with the occasional drop or rise. Most of the area is so thick with the grass that you can't see the dirty soil underneath. And sometimes you can see a few collections of wildflowers also, though most simple whites and yellows. Surrounding the Hayden Valley are even, forested hills, that add to the "low and green" feel. A single river, sometimes inhabited by fish, twists through the grass.