Closely related to the cockroaches, most species of cricket live outdoors, only rarely entering premises. One species, however; the House Cricket, may live within buildings throughout the year. 16mm long and yellow brown with darker markings on head and thorax it favours warm, humid locations such as the heating duct systems of hospitals.

They are less common in domestic households than they once were largely because of the loss of the traditional fireplace. They are nocturnal and are considered a pest mainly because of the chirping of the males, produced by their front wings being rubbed together. They may damage foodstuffs and fabrics.