Pronghorn

https://www.youtube.com/channel/UCm1PS7o2U39LnOZdhDuoE-Q
Pronghorns are the only remaining member of the Antilocapridae family. They can run up to 65 miles per hour, making them the fastest North American land mammal. The hair shaft on pronghorns is hollow, which keeps them insulated in freezing climates. Pronghorns usually give birth to one or two babies, called fawns, who can outrun humans when they are just two days old. When Lewis and Clark first wrote about this animal, it is estimated that there were about 3.5 million, but that number has been reduced to 800,000, which is still better than the 13,000 believed to have been alive in 1915.