The Crab Castrating Zombifying Parasite – (modified host behaviour)

Practically ignored and unstudied since an outbreak among Alaskan crabs in the 1980s, this parasitic barnacle can actually control, castrate, and feminize its host!

Briarosaccus callosus eventually influences their behavior with the sole purpose of infecting others with its larvae, creating what marine biologist Leah Sloan refers to as “zombie crabs.”

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ADVANCED CIVILIZATION Reference material - https://interestzine.com/modified-host-behavior/