Are You a Zombie?
There are parasites that infect certain insects and turn them into self-destructive zombies (and it turns out this can happen to people too–do you own a cat?)
When a shrimp-like creature called a gammarid gets infected by a certain type of worm, it becomes a zombie and swims towards the water’s surface, where they can easily be picked off by birds, which the worms need to complete their life cycle.
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