Damselfly nymphs are among the most effective invertebrate predators in freshwater. You have to see one in motion to get a feel for their slow, deliberate style of stalking.
Calopteryx
These are beautiful as adults. Wherever you get these, you should go back when they are emerging. Alternatively, keep them in your aquarium until they emerge. They're easy enough to keep...except when you have Aeshna with them...
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