 A closer look into the behavior of Cornu aspersum , shows that it is not the mechanical action of the dart that increases paternity in sperm donors but instead the mucus that coats the dart . The mucus carries an <unk> that is transferred into the recipient snail ’ s hemolymph when the dart is stabbed . This <unk> <unk> the female component of the reproductive system in the receiving individual : the bursa <unk> ( sperm digestion organ ) is closed off , and the copulatory canal ( leading to the sperm storage ) is opened . This reconfiguration allows more sperm to access the sperm storage area and fertilize eggs , rather than being digested . Ultimately this increases the shooter ’ s paternity . 
