The problem is, how do you know whether the inevitable snail deaths were caused by hermit crabs or some other unknown factor? You may see your hermit crabs apparently eating a snail at some point in time, but it would be difficult to tell if they actually caused its demise.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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