The larvae of dragonflies squirt water out their anuses to lunge forward after prey thanks to hydraulic linkages.

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"Hydraulic linkages occur in a wide variety of biological systems…In addition, one can point to the predatory strike of dragonfly larvae, which lunge forward by squirting water out their anuses (Tanaka and Hisada 1980)…" (Vogel 2003:420-421)

Comparative Biomechanics: Life's Physical World, Second EditionJune 17, 2013
Steven Vogel

Journal article
The hydraulic mechanism of the predatory strike in dragonfly larvaeJournal of Experimental BiologyAugust 25, 1980
Tanaka, Y; Hisada, M

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Living System/s

Holarctic SpringflyAnisopteraSpecies

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