Sweet little hedgehog tattoo

A defense that all species of hedgehogs possess is the ability to roll into a tight ball, causing all of the spines to point outwards.[5] The hedgehog's back contains two large muscles that control the position of the quills. When the creature is rolled into a ball, the quills on the back protect the tucked face, feet, and belly, which are not quilled. Since the effectiveness of this strategy depends on the number of spines, some desert hedgehogs that evolved to carry less weight are more likely to flee or even attack, ramming an intruder with the spines; rolling into a spiny ball for those species is a last resort.

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