There is a large variety of wildlife in Montana and every creature has its own special function within the ecosystem. Ecosystem is the way plants and animals species interact with one another, each one doing its own job to keep nature in balance. Animal species in Montana range in size from the tiny shrew to the huge American bison. There are numerous bird species, which occupy every kind of habitat. Montana is unique in being one of the last places in the lower forty-eight states to have more animals than people. Here are snapshot views of some of Montana's animals.