Hedgehogs curl into balls to protect their spines

When sensing danger, hedgehogs rapidly contract powerful orbicular muscles, transforming into a tight, spiny ball in seconds. This remarkable defense exposes up to 5,000 sharp spines, safeguarding their vulnerable underbelly and face from predators like foxes. This ancient adaptation, refined over millions of years, allows even small mammals to deter larger attackers through clever anatomy. Young hedgehogs, or hoglets, are born without this full ability, relying on their mother until their muscles develop.