Because he's a hedgehog, and hedgehogs in real life do that to protect themselves. Sonic, on the other hand, does it to charge up his spin dash.
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Ummm.....However a hedgehog does.....I think he just curls up.
I think Amy Rose showed up in Sonic CD, in 1993.
there will not be a sonic 5 i looked up sonic 2 and if there is no sonic 2 there will not be a sonic five there you have your answer
Sonic the hedgehog is a video game to Xbox360 and Playstation3. the game is also called Sonic Next-Gen or Sonic 06 to not be mixed up with the first Sonic game.
Maria is simply a made up hedgehog and if you have ever herd of sonic the hedgehog maria is one of our hedgehog heros.