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I imagine that over the course of time, there may well be a whole pile of teeth waiting to be harvested right next to my base. I was always disappointed you couldn't tame stalkers permanently with fish gifts, but it seems that raising them in the aquarium will work. I did that with a stalker, let it go right by my base with a nice piece of titanium for him to play with, and the next thing I knew, there was a pile of 4 titanium right next to my base, and every time a piece fell off the ledge, he'd dive down to get it and often drop a tooth or two! And the stalker wasn't trying to nip me, even though he was right next to the base.
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It turns out that if you raise a stalker from an egg in the alien containment (and probably the other predators too), they don't attack you if you let them go.
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