Trailwood Films

The river otter lives across much of the northern hemisphere of Earth, although as with many wildlife species, their numbers are decreasing. In Yellowstone they are holding their own. Life seems easy for them, but the way they meet their difficult moments demonstrates why they have the reputation as such vivacious and vigorous survivors. That's captured here -- River Masters of Yellowstone. In the 1920s wolves were completey wiped out of Yellowstone Park. With the re-introduction of the wolf in 1995, coyotes went from top dog to underdog.