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In page Newcomb's snail:

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Several introduced, predatory aquatic species, including the green swordtail fish Xyphophorus helleri, the American bullfrog Rana catesbeiana, the wrinkled frog Rana rugosa, and the cane toad Bufo marinus potentially threaten populations of Newcomb's snail. All potentially prey on the Newcomb's snail.[1]