Habitat Adaptation An animal’s movement depends directly on its habitat (land, air, water) and body design. Birds adapted to the sky with wings, fish adapted to water with fins, and land mammals evolved robust legs for walking.

Slithering Mechanics Snakes have a long, flexible backbone and numerous muscles and scales. They loop their bodies sideways, pushing against the ground and rough surfaces to propel themselves forward in a wave-like motion.

Streamlined Body Fish have boat-like (streamlined) bodies that cut through water effortlessly. Their fins help maintain balance, while tail muscles whip back and forth for forward thrust.