They live in a wide variety of habitats , generally terrestrial , though some species are adapted to life in or on the surface of fresh water .
Some are parasitic while others are predators that feed on other insects or small invertebrates .
others live in a wide variety of habitats , generally terrestrial , though some species are adapted to life in or on the surface of fresh water .
Some are parasitic while others are predators that feed on other insects or small invertebrates .