1.   Embedded in the canyons are fossils of extinct creatures like giant camels, mastodons, short-faced bears and sabertooth cats.

2.   The new sabertooth cat combines some of the deadliest features of the others.

3.   What the amateurs had found was a third category of sabertooth cat.

4.   When he realized they went together, he said, paleontologists had to characterize a whole new group of sabertooth cats.