Leucochloridium is a parasitic worm that invades a snail's eyestalks, where it pulsates

Leucochloridium is a parasitic worm that invades a snail's eyestalks, where it pulsates to imitate a caterpillar. The worm then mind-controls its host into the open for hungry birds to pluck out its eyes. The worm breeds in the bird’s guts, releasing its eggs in the bird’s feces.
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(TITLE FROM REDDIT r/educationalgifs)

Parasites of all kinds are so crazy. They are survivors for sure

this will jump to humans, coming October 2020