A kangaroo pouch works as a living safety harness and cafeteria, built to keep a tiny joey secure and fed while the mother hits sprinting speeds. The opening is a vertical slit of skin, backed by a strong sphincter muscle that tightens like a drawstring, so the pouch can clamp half‑shut as the animal accelerates, corners or lands from a jump.Inside, the joey does not bounce freely. Sticky mucus, s...More