I've always found the lemming to be one of the more interesting inhabitants of the alpine grasslands.
For instance, did you know that they can burrow through the snow, making tunnels that allow them to get at the soft grass stems under the snow?
Also, contrary to popular belief, lemmings do not run themselves off of cliffs. This is a common misconception perpetuated by early animal TV shows, which actually included film crews stampeding lemmings off of cliffs just to get a shot.
However, lemmings do not run off of cliffs, although the do migrate in mass, and sometimes end up dying as they try to swim across rivers.
But no suicidal lemmings -- that myth has been busted long ago.