Once infected, the fish make their way up to the water's surface where they'll swim until eaten by seabirds. Once again, the peculiar behavior can only be explained by the parasite's desire to get into the bodies of the seabirds. Leucochloridium = This parasite's sporcysts develop in the snail's tentacles.

The sporocysts are vivid in colour and pulsate continually somewhat like a worm. Surprisingly the infected snail makes its way to the top of a plant where it is most visible to the eyes of birds, therefore more likely to be eaten. Once eaten by a bird, the parasite will complete its metamorphosis into an adult.