Deathbeast — David Gerrold

TIMEBEAM TO DANGER
Six hunters and two official guides are going on the trip of their lifetime.

Their destination? Earth as it was a hundred million years ago, long before human dominion, when the great hot-blooded dinosaurs ruled supreme.

Each of the time travelers has a different motive. Some are on the strange safari for pay. Others are taking a psychological and sexual holiday from civilization. There are women who wanted to show themselves the equal of men -- and men out to test and prove their manhood.

But whatever their drives and desires, their strengths and weaknesses, the ultimate horror awaits them...DEATHBEAST.