The hedgehog relies for defence on its protective spines, rolling itself into a ball in a similar fashion to a [[pangolin]] or [[armadillo]] when threatened. This tactic, while effective against many predators, is of little use against motor vehicles, and many hedgehogs are killed on roads every year. [[Badger]]s have been observed to drop them in water to induce them to unroll. Unlike those of the [[porcupine]], hedgehog spines are non-detachable, and rarely used aggressively. | The hedgehog relies for defence on its protective spines, rolling itself into a ball in a similar fashion to a [[pangolin]] or [[armadillo]] when threatened. This tactic, while effective against many predators, is of little use against motor vehicles, and many hedgehogs are killed on roads every year. [[Badger]]s have been observed to drop them in water to induce them to unroll. Unlike those of the [[porcupine]], hedgehog spines are non-detachable, and rarely used aggressively. |