Good luck with Part 2. I had no Mantis in part 1. But then, it was only about 25 lbs of rock. Interestingly, 3 gorillas in part 1 and only 1 in part 2 (that I have found). unfortunately, they dont give themselves away with that constant clicking. If they did, I'd nail 'em with that grabber.
Cheers!
Cheers!