The Saiyans are a race that love to fight. They cannot resist fighting a "discrace to all sayians"(Goku). All saiyans have tails. It gives them much more power but it is a weak spot if someone squeezes it(It happend against Radditz). It has another purpose as well, go oozaru! This means they turn into a huge ape. Some people can control it like Vegeta. But Goku And Gohan can't. But they have ONE more deadly skill. Go SUPER SAIYAN! Super Saiyan is when a sayain gets so mad that there anger builds up there power. So sometime in that stage that they are real mad, there hair will turn gold.

Super Saiyan: When a saiyans anger builds up and there hair turns yellow and raises there power enourmously.

Super Saiyan 2: When you get even more angry. For Gohan, it was Android 16 getting killed. They have more hair and bigger power at Super Saiyan 2.

Super Saiyan 3: Even more angry now. There hair grows as long as Radditz. There Eyebrows Dissapear. They get very strong here.

Super Saiyan 4: This is DragonballGT. Same way as last time to go super saiyan 4. But there have red fur and they grow there tail back. They can even go oozaru any time they want! But for some reason, Vegeta has leather pants Super Saiyan 4...

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