Getting stabbed is no fun for land snails
![two snails mating](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/03/wt_snail_lovedart_free.jpg?fit=860%2C460&ssl=1)
As these hermaphroditic land snails mate, one of them has turned its muscular sac outwards (arrow) and shot a love dart from within into its partner. The behavior is advantageous for the shooter, but its partner suffers, a new study reveals.
K. Kimura and S. Chiba/Proceedings of the Royal Society B 2015