>>I should point out that just because two species inhabit the same space does not mean that they are compatible; after all, predators live where their prey live. In any case, crayfish are capable of great destruction, especially to soft-bodied animals like amphibians, even if they do not wish to eat the amphibians.>>

That is quite true and I don't mean to imply that just because the newts I observe share the same stream as crayfish, they can then be kept together in an aquarium. In captivity, where the prey species cannot escape or hide, the predator may have an unfair advantage.

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