Female dragonfly lay eggs in or near water, often on floating or emergent plants. When laying eggs, some species will submerge themselves completely in order to lay their eggs on a good surface. The eggs then hatch into nymphs. Most of a dragonfly's life is spent in the naiad (that is, nymph) form, beneath the water's surface, using extendable jaws to catch other invertebrates or even vertebrates such as tadpoles, fish, etc. They breathe through gills in their rectum, and can rapidly propel themselves by suddenly expelling water through the anus.
I'm not making this up! check Wikipedia...
http://en.wikipedia.org/wiki/Dragonfly
Dragonfly, Forest of Dean
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