See Majestic Historical Photos of the U.S.’s New National Mammal

The President signed the National Bison Legacy Act into law on Monday, making bison the country's first national mammal. The animal is already a state symbol of Oklahoma, Kansas and Wyoming, and appears on the Wyo. and Kan. state flags.

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The law is the culmination of a four-year push by a coalition of more than 60 organizations, businesses, Native American tribes and wildlife advocates who hope that the recognition will help preserve the species in the future — despite bison almost going extinct at the turn of the 20th century. Experts believe the number of bison dropped from roughly 30 million bison in the 16th century to less than 1,000 by the late 19th century, due to a combination of environmental problems and economic demand for their hides, which drove overhunting. A national effort to reverse trend helped ferry the remaining ones to protected areas, and by the mid-20th century, the species had started to make a comeback.

MORE: Jared Leto: The Bison’s Comeback Is an American Epic

While roaming through this gallery of bison roaming, keep in mind that these are technically bison not buffalo—though Americans tend to use the terms interchangeably—because they have shorter horns and shoulder humps.

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