These elegant, elongated bones are part of a design honed by millions of years of evolution—forming the flexible, muscular frame of a creature built for stealth, precision, and fluid motion. Unlike most vertebrates, snakes use their ribs as active components of movement. Muscles connected to the ribs engage the skin and ventral scales, allowing the snake to grip and push against surfaces as it slithers, climbs, or crawls. This rib-powered system enables a wide range of locomotion styles, from sidewinding across desert sand to the slow, inching crawl of rectilinear motion. In rattlesnakes, these ribs take on an additional role. Toward the tail, specialized musculature anchored to the ribs helps power the rapid vibration of the rattle— producing a distinctive warning buzz that can reach over 90 shakes per second. This unique adaptation turns ordinary skeletal elements into part of a high- speed sound-producing system, unlike anything found in other snakes. Includes 3 genuine rattlesnake ribs in a display capsule.