Two-legged animals are not common, but there are some situations where this abnormality can occur:
Animals lose limbs or suffer trauma: Some animals may sustain serious injuries in the wild or during fights with other animals, resulting in the loss of one or more legs. In such cases, the animal may still be able to survive, but the chances of survival are usually slim.
Birth defects: Sometimes animals may be born with congenital defects, such as missing limbs.
Variants bred from special breeds: In some cases, through artificial selection or genetic mutations, special breeds of animals may appear, which may have an abnormal number of legs, such as three.
In general, most mammals, reptiles and birds have four legs, and their limbs are their basic tools for survival and movement. For three-legged animals, it is usually due to some special circumstances, such as congenital anomalies or trauma.
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