Crane Flies (family Tipulidae) look like giant mosquitoes, but they are harmless.  They are sluggish fliers and commonly found in moist woodlands and around water, near areas where their larvae are found.  Adults are usually seen in spring and fall.  There are about 1,600 species in 64 genera in North America and many look very similar.  They are usually identified by experts on the differences of wing venation.  The larvae of most species feed on fungi, decaying organic matter or the roots of sod grasses and cereal crops.  Some have predatory larvae and many serve as a major food source for shorebirds in wetlands and, particularly, in the Arctic tundra.  The larvae usually overwinter and pupate the following spring.

The genus Nephrotoma includes 40 species in North America and is sometimes known as tiger crane flies.  The genus Tipula has over 480 species in North America and the larvae can be either terrestrial or aquatic depending on the species.   The genus Gnophomyia includes 3 species north of Mexico.  The larvae feed on fungal mycelia in rotting hardwood stumps and logs.