This illustration depicts a left lateral view of a flea, highlighting some of the morphologic characteristics on the thoracic region, used when identifying these insects. In this case, the leg anatomy is emphasized. There are three pairs of highly specialized jointed legs, which originate on the thorax, and are relatively long, for jumping. The average flea can jump 7 to 8 inches vertically, and 14 to 15 inches horizontally. Each leg is composed of five parts: coxa, trochanter, femur, tibia, and five segmented tarsi.