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Sticky sex

发布时间:2019-03-06 14:14:09来源:未知点击:

The “love dart” that garden snails stab their partners with before sex helps them retain sperm, say Canadian biologists. Land snails are hermaphrodite, and when acting as females destroy sperm from undesirable partners using a sperm-digesting gland. To save their sperm from that fate, the “male” snail tries to stab its partner with a mucus-coated calcium carbonate dart before mating. A chemical in the mucus makes the snail close off the entrance to the sperm-eating gland. David Rogers and Ronald Chase of McGill University in Montreal found that as a result,