Hell Pig — Lou Cadle

A time gate...
A team of teen scientists...
A desperate fight to survive...

In book 3 of Dawn of Mammals, an emotionally devastated Hannah and the survivors leap forward to the end of the Eocene, a time when dozens of dangerous predators roamed North America. A family of Hell Pigs, entelodonts sporting massive jaws filled with bone-crushing teeth, stalk the humans. Armed with only spears and clubs, can the teenagers fight off this deadly predator?

(Dawn of Mammals is a series that should be read in order for the best reading experience.)