For over 2 million years, dire wolves roamed present-day North America until their extinction around 10,000 B.C. On Monday, a Dallas-based bioscience firm said it had brought the species back to ...

Only males emit this trademark ... of all North American frogs, this giant can grow to a length of 8 inches or more and weigh up to 1.5 pounds. Even the tadpoles of this species can reach 6. ...

But humans living in ice age North America had to deal with the real thing. Dire wolves (Canis dirus) were a canine species that hunted the plains and forests. They were similar to modern grey ...