Why Are There No Three Legged Animals?

There are no animals in nature that are three legged. However, most of the animals are four legged or Quadrupeds or have 2 legs or are Bipedal. This is because having four or two legs ensures that the animal can balance itself. For reference see the link below:
en.wikipedia.org

Because if animals have three legs it would be harder to balance and walk for animals.

Ok think of a chair. It has 4 legs so it can balance and hold itself up, or the chair (and you) would fall over. If animals had 3 legs they would always be falling over. It would be much harder to stand on 1 leg! Hope this helped!

Your question is interesting!

According to Darwinism,the animals should have four legs or two so they can run faster and grow better.

There are know three legged animals for there balance

Cuz they wold fall over