The struggle to survive isn't always a fair fight. Here's what separates nature's winners from its losers.
Black skin on a roadrunner’s back soaks up sunshine so the bird is warm and ready to run.
Roadrunners break the bones of their breakfasts by pounding prey to a pulp against rocks.
Roadrunners zip along at 18 miles per hour, faster than Olympic athletes run the mile. No other American bird runs faster.
Collared lizards steer with their rears, swinging their long tails out for balance when they tear around tight turns.
A collared lizard’s back legs are three times longer than its front legs. Running upright helps the lizard take longer strides and reach speeds of 16 miles per hour.
Roadrunners are so quick, they’ve been seen plucking hummingbirds out of the air. With that kind of speed, this lizard’s lunchmeat unless it finds a rocky retreat to dive into.
Nichole LeClair Terrill