In 1872, Yellowstone became the first National Park in the United States with the signing of the Act of Dedication by President Ulysses S. Grant. The park covers almost 9,000 square kilometers and is situated in three states: Idaho, Montana, and Wyoming. The largest share of the park lies within the border of Wyoming.
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Canis lupus - With the exception of some large breeds of the domesticated dog, the grey wolf is the largest member of the Canidae family and the only one native to the Old and New World. The social structure of the grey wolf is based on the family pack, a unit organized around two paired alpha adults, several juveniles, and the recently born pups. The juveniles help in caring for the yearlings, but begin to set up their own territories and families as they reach sexual maturity or when available food sources fall into decline.
