Digenetic trematodes are parasitic flatworms with complex life cycles, typically involving two or more hosts.
This guy first (damn chicken and egg situation here) gets into a water snail and lay the eggs. The larvae eat the snail inside out. Then they escape into the pond. Gets a bit funny. So these larvae search tadpoles and get into their rear ends. They wait untill the tadpole gets begger and into a frog. The parasite then make the frog's body make an extra leg at the rear end. So the frog is hmmm disabled and cannot escape the predatory birds. So the frog gets eaten by a bird. This is what the prasite has been waiting for. Sex.
In the bird's tummy the perasite have sex and goes out of the bird as poo. Hey hey we start at the hmmmmm startd. In the pond bird's poo eaten by the snail. Gosh. That must have been a lot of reseach for the parasite init?
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