Field crickets and house crickets are celebrated singers. There are many species in North America, and they can be hard to tell apart. They have large heads, hind legs adapted for jumping, and stout, unmovable spines on the hind legs. Species may be black, brown, or tan. Adult females have a needlelike (but harmless) ovipositor extending outward from the abdomen; all have a pair of filament-like circi extending from the abdomen (each cercus functions like an antenna).
Members of the genus Gryllus are usually shiny black, and the different species are often best separated by singing pattern. Scientists use The house cricket, Acheta domesticus, is light brown or tannish overall; the tan head has three dark crossbands; the wings of adults extend beyond the tip of the abdomen.