The Japanese Trapdoor Snail is one of a few snails that will survive in water that is practically frozen, as long as your pond is not a block of ice. These snails will hibernate until water temps are above 40F. At a maximum size of 2 inches, this snail will be larger than a golf ball when fully grown... This size along with a matching appetite for Algae, dead plant matter and organic waste, this will be a great investment for any pond.
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