The cougar (Puma concolor), also known as mountain lion, is the one of the largest cats in North America and a top predator native to Greater Yellowstone.
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Elk. The most abundant large animal found within Yellowstone, Elk summer herd sizes can reach up to 10,000-20,000.
The wolverine is probably the rarest animal seen in Yellowstone. The US Fish and Wildlife Service: Wolverines are the largest land-dwelling member of the mustelid family and are extremely rare in the continental United States.
Wolves in Yellowstone sit at the core of a larger population connected throughout the Greater Yellowstone Ecosystem. In general, wolf numbers have fluctuated between 83 and 123 wolves since 2009.
Presently, the estimated grizzly bear count in the greater Yellowstone area exceeds 1,000, with 150 to 200 of these bears residing partially within the park's boundaries. These bears occupy a range spanning around 22,500 square miles.
Is it safe to drive in Yellowstone at night? Yes, but take caution. Wildlife is active at night and it can be difficult to see animals on the road until it's too late.
The Pronghorn is the fastest North American land animal, capable of reaching speeds of up to 60 miles per hour. The pronghorn's speed is its main defense against predators. The newborns, for the first few days of their lives, are vulnerable to coyotes.
Now they are well established in Yellowstone and are found throughout the Northern Rockies of Montana, Wyoming and Idaho. About 120-130 wolves currently roam Yellowstone. Even though Yellowstone is probably the best place in the world to spot wild wolves, it's not always easy to find them.
As the dominant breeding female (alpha female), O-Six was one of the most visible and photographed wolves in Yellowstone and was described as a rock star. She was famous for hunting and taking down elk by herself, which is extremely rare as wolves usually hunt in packs.
Always stay at least 100 yards (91 m) away from bears and wolves, and at least 25 yards (23 m) away from all other animals, including bison and elk. Hot springs have injured or killed more people in Yellowstone than any other natural feature. Keep your children close and don't let them run.
Wolf: One of the most elusive Yellowstone animals and one of the most rewarding. Wolves can be seen hunting in packs in one of the valleys, or they can be a lucky sighting that lasts just a minute as they travel past the road, vanishing as quickly as they appeared.