The roadrunner is a large, slender, black-brown and white streaked ground bird which has an average weight of 8 to 15 ounces, and is about 18 inches (46 cm) to 22 inches (56 cm) from tail to beak. It has long legs, strong feet, and a big dark beak. The roadrunner is terrestrial (lives on land). Even though it can fly, it spends most of its time on the ground. When they fly their wings are short and rounded and have a white crescent on the feathers. Roadrunners and other members of the cuckoo family have zygodactyl feet (two toes on the front and two toes on the back). Roadrunners can run up to the speed of 20 miles per hour (32 km per hour). They fly to escape predators.Some Roadrunner run til 26 miles per hour.