There are over 20,000 species in this family worldwide. Darkling beetles are mostly black, they have a characteristic eye notch covering the antenna-base, and the first three plates on the underside of their abdomen are fused. Most species have fused wing cases (elytra), making them flightless. Some have chemical defenses, making them distasteful to predators.
Many darkling beetle species are nocturnal.
Darkling beetles feed on dung, fresh and decaying vegetation, and scavenge dead animals.
Widespread, but mainly in dry regions, including Azraq, Wadi Dana, and Wadi Rum.