Damselflies have existed since the later Carboniferous (early forms may be put in the Protozygoptera by some authorities). They are found on every continent except Antarctica. One feature of their life is different from dragonflies. Not only do their nymphs grow in rivers, but the adults usually keep close to the river, and live in colourful little groups. Most damselflies live their lives within a short distance of where they were hatched.