Because mammals aren't man-made, wheels are.
Animals evolved.. giving them legs xD..
Added:
Think of the physics needed to put wheels on animals. Physical constraints are a brake on many things evolution can not do for organisms.
you cant get district scooter wheels any where they dont make district wheels
no rockets dont have wheels
no i dont think so
beside yo mom i dont know any other animals
They're unpredictable and dont speak any of the languages of the world
i dont think so iv had the same prob, just get new trucks and wheels
Carnivores are animals that dont eat plants in any way!
they dont use wheels they fly
They are good, you can use them for any pro tricks and they can hold up to any trick. The only problem is, the wheels arent metal core, so they dont roll fast, and the wheels crack
any that dont want to be eaten
snake doesn't have any ears. but it can hear with its tongue.
I dont know but i know a cheat for all properties its: XOXOXOX[][]LeftLEftXXX