Hedgehog spines, made of keratin, act as a defense mechanism. When threatened, hedgehogs roll into a tight ball, displaying ...

Equally unfortunate is that the hedgehog isn't very fast on its feet. It's slow even when it tries to speed up. When threatened by a fox or cat, they roll into a ball, extending their spines outward.

Visit BBC Webwise for full instructions Once a common site in the British countryside and gardens, hedgehog numbers ... If they're disturbed they'll roll up into a ball so their soft underside ...