Fleas smell exhaled carbon dioxide from humans and animals and jump rapidly to the source to feed on the newly found host. The flea is wingless so it can not fly, but it can jump long distances with the help of small, powerful legs. A flea's leg consists of four parts: the part that is closest to the body is the coxa; next are the femur, tibia, and tarsus.
Fleas detect exhaled carbon dioxide from humans and animals and swiftly move to the source to consume the newly discovered host. The flea lacks wings, but it can cover considerable distances with the assistance of its small yet powerful legs. A flea's leg is composed of four parts: the section closest to the body is the coxa; next are the femur, tibia, and tarsus.