Corrected entry: Grace incorrectly relates Jake's escape to the others: The last thing we see is this Marine's ass disappearing into the brush with this angry thanator coming after him. That was not a thanator; that was a different type of creature altogether. The thanators were the hammerhead-rhino creatures, but the one that chased Jake was a very different sleek black creature.
AdamChurvis
26th May 2012
Correction: The creature that chases Jake is a matter of fact a Thanator. The other "hammerhead-rhino" creature is called Hammerhead Titanothere.