I know that all of you out there don't know of all the different races in Dragonball, but I do. So there. Ha. Ha. Any way just read and be amazed.

Sayins
The mighty warriors under the controle of Freeza. These mighty warriors are fierce fights that love to battle and when they loose they become even stronger. One special atribute of this race is that they can transform into giant apes at the sight of a full moon. They can do this because they have a monkey tail. If their tail is cut off they loose this ability until they regrow it back.
Humans
The humans in Dragonball contribute a lot. For instance Bulma met Gokou and started Dragonball. Krillin and Chi Chi are also main charecters and fighters through out Dragonball. Master Roshi is also human. If he didn't train Gokou we wouldn't have much of a story, but he did so luckly we still have Dragonball.
Namekians
A snail like looking race with some exceptionaly good fighters, but only want peace. This race of people created the original Dragonballs that are more powerful then the original Earth balls. Nameks have the ability to regrow lost limbs and exstend the limbs as well.
Mutants
Being with strange and unusual powers. Some trans form, some can stop time, and some can switch bodies with people. The mutants race really covers many races that all have one thing in common. They all have powers uniqe to themselves.
Yardrats
A peaceful rather weak race with some unique powers. They teach Gokou the instant transmission. This race of people would rather help some person they don't know heal then to fight them. They come in very useful because if they didn't teach Gokou the instant transmission Cell would have killed everyone.