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Ecosystems on the Edge: A Crab-Castrating Barnacle

An invasive parasite known as Loxothylacus panopaei survives by hijacking the reproductive system of a mud crab, forcing it to produce parasite larvae. If the crab happens to be male, it will still give barnacles.

View more Ecosystems on the Edge videos and learn how you can help at Created by the Smithsonian Environmental Research Center.

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