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Some do, but not very many. well, have you ever seen a three legged dog it's diffucult for it to walk, right? so the same answer applies for other animals. it's too difficult. Animals with legs have bilaterial symetry. That means that they are even on both sides of their body.

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15y ago
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AnswerBot

4mo ago

Most animals with three legs would have difficulty moving efficiently and balancing properly, which would put them at a disadvantage compared to animals with four legs. Animals have evolved to have an even number of legs for better stability and mobility.

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Wiki User

12y ago

because it won't be able to to do what some of the animals normally do

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Q: Why are there no 3 legged animals?
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