I really hate where they decided to put Terrorpene's spawn. Right next to a raid entrance. Makes taming him a real pain. Only reason I'm even sticking with it is because every other turtle model in the game is so bland looking.
Terrorpene you have to get really lucky with, since he'll get gobbled up pretty quick as soon as he spawns.
For a long while, I was using the other similar model (the one Tortolla uses; there's a turtle in BFD that has it).