The Dire Wolf, the largest species of Canis known to have existed, lived from about 125,000 to 9,500 years ago,  and based upon skull measurements, it is believed that climate fluctuations caused its extinction.
The Dire Wolf, the largest species of Canis known to have existed, lived from about 125,000 to 9,500 years ago,  and based upon skull measurements, it is believed that climate fluctuations caused its extinction.