The credits page has a note as to what the subject of each photograph is.
This is the (American) bison, some refer to it as a buffalo. These guys used to live all across the US, in Canada and as far south as Mexico. However, in the last few centuries, the needs of people for food, farming land, and other resources increased. This caused the numbers of bison to fall, and their range became much smaller. Considerable effort has been made to prevent their extinction. Most bison now live in reserves or on private land; with one of the largest herds in the Yellowstone National Park.
This image may be useful if you are making a list of mammals, or brown organisms, or indeed want to emphasize the point made on the ‘White‘ pages, that an animal is less likely to be seen if its color matches that of its surroundings.
If you have more ideas, please let us know below.