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.
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Approximately 150–200 with home ranges wholly or partially in the park. As of 2021, 1,063 estimated in greater Yellowstone.
26–36 inches tall at the shoulder, four to six feet long from nose to tail tip.Males weigh 100–130 pounds, females weigh 80–110 pounds. Home range within the park is 185–310 square miles (300– 500 km2); varies with pack size, food availability, and season. Average lifespan in the park is four to five years.
About 800 moose inhabit the southern part of Yellowstone, Grand Teton National Park and surrounding national forests. This largest member of the deer family loves cold weather and frequents marshy meadows and edges of lakes and streams.
It's perfectly possible to spot a bear any time of day in the Park, especially in cooler weather, but mid-summer you are unlikely to see bears out in the heat of the day, when they tend to nap in the forest. You don't need to go hiking into the backcountry to see bears.
In 1999, a wolf pack denned in Grand Teton and produced a litter of pups—the first in the park in over 70 years. Since then, wolves continue to live and reproduce in the Jackson Hole area, including Grand Teton and the John D. Rockefeller, Jr.
The mountain lion, also called the cougar, is the largest member of the cat family living in Yellowstone. Mountain lions can weigh up to 200 pounds, although lions in Yellowstone are thought to range between 140 and 160 pounds for males and around 100 pounds for females.
There are an estimated 500-600 black bears inhabiting Yellowstone National Park. Black bears are not all black; their coats can be cinnamon, blonde, brown or black. Brown -colored black bears are sometimes mistaken for grizzlies.
Wolves – The re-introduction of wolves to the Yellowstone ecosystem in 1995 caused a nationwide uproar. As wolf packs spread throughout the region and attack ranch animals, the controversy is very much alive.