Birds
Greater Roadrunner
Geococcyx californianus · also called roadrunner, chaparral cock, correcaminos
The greater roadrunner is a cuckoo that gave up flying to become a runner. It streaks across the desert Southwest on long legs, hunting lizards, scorpions, and rattlesnakes, and it has a set of physiological tricks that let it live where there is almost no water.
Overview
Greater roadrunners live in open, arid country across the southwestern United States and much of Mexico — creosote and cactus desert, mesquite scrub, chaparral, grassland, and the edges of dry woodland. They are ground birds, spending nearly all their time walking and running, and they hold year-round territories as bonded pairs, which they announce with a soft, descending coo and a wooden clatter of the bill.
Built to run and to hunt
The roadrunner’s body is a compromise pushed toward the ground: strong legs, a long tail used for steering and braking, short rounded wings good only for brief glides, and feet with two toes forward and two back (the cuckoo pattern) that leave an X-shaped track. It runs at up to about 30 km/h, head low and level, and takes prey by running it down.
Its diet is unusually carnivorous for a cuckoo: lizards, snakes, scorpions, tarantulas, large insects, mice, and small birds, plus some fruit and seeds in lean times. Hard or dangerous prey is killed by battering it against a rock, and rattlesnakes are sometimes tackled by a cooperating pair.
Desert survival
Roadrunners are superbly adapted to heat and drought:
- They do not need to drink, taking all their water from prey.
- A nasal salt gland lets them dump excess salt without wasting water in urine.
- On cold mornings they sunbathe, exposing a black skin patch on the back to warm up without shivering, and they let their body temperature drop overnight to save energy.
Reproduction
Pairs build a shallow stick nest in a low tree, cactus, or bush, and both parents incubate the two to six eggs and feed the chicks, which grow fast on a protein-rich diet of reptiles and insects. In poor years, adults may not raise all the young, and the smallest chicks can be eaten.
Status
The greater roadrunner is Least Concern and common across its core range, and it adapts well to farmland and rural settlement. It has been declining at the northern and eastern margins — in parts of California, Kansas, Missouri, and Louisiana — mainly from habitat loss, and it is vulnerable to cold winters, vehicle strikes, and predation by domestic cats and dogs.
Greater Roadrunner: common questions
How fast can a roadrunner actually run, and can it fly?
A greater roadrunner can sprint at around 30 km/h, holding its head and tail flat and level and using the long tail as a rudder and brake. It can fly, but only weakly and briefly — short glides from a perch or over an obstacle — so it does almost everything on foot, including chasing down prey and escaping predators. It is one of the few birds that has largely traded flight for running.
Do roadrunners really kill rattlesnakes?
Yes. A roadrunner will tackle a rattlesnake, and a bonded pair sometimes hunts one cooperatively — one bird feints and dodges in front to hold the snake's attention while the other darts in from behind, seizes it just behind the head, and beats it repeatedly against a rock or the ground until it is dead. The bird then swallows it, and if the snake is too long to fit, it walks around for hours with the tail hanging out of its bill, digesting the front end first.
How does a roadrunner survive in the desert without drinking?
It extracts water from its food — prey is mostly water — and conserves it aggressively. A specialised gland near the eyes secretes concentrated salt solution, so the bird can get rid of excess salt without losing much water in urine, and it reabsorbs water from its faeces. On cold desert mornings it also fluffs up the feathers on its back to expose a patch of black skin and turns it to the sun, warming up passively instead of burning energy to shiver.
Is the cartoon Road Runner accurate?
Only loosely. The real roadrunner is fast and lives in the desert Southwest, but it is a modest-sized bird that cannot outrun a coyote (coyotes reach around 65 km/h) and does not say "meep meep" — its actual call is a slow, descending series of low coos, plus a bill-clatter. Coyotes do prey on roadrunners, so the cartoon rivalry has a grain of truth, just with the speeds reversed.