This flatworm species has the most extreme soldiers yet among parasites. When the nest of Haplorchis puilio is threatened, the soldiers crawl up to the foreign trematodes, attach their mouths, and expand their throats. The resulting vacuum blows a hole in the larger parasites, allowing the soldiers to suck out their guts.
Video by: Sierra Boucher/Science
Footage: Daniel Metz
Music: Chris Burns/Science

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