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


"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 EditionOctober 24, 2016
Steven Vogel

Journal article
The hydraulic mechanism of the predatory strike in dragonfly larvaeJournal of Experimental BiologyOctober 24, 2016
Tanaka, Y; Hisada, M

Holarctic SpringflyAnisopteraSpecies