In a comparison of birds and mammals, the condition of having four limbs is

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Having four limbs is a shared ancestral character that is found in both birds and mammals. This means that the common ancestor of these two groups also had four limbs, which were passed down to its descendants. Therefore, having four limbs is not a useful character for distinguishing between birds and mammals or sorting bird species, as both groups possess this trait. Additionally, it is not an example of analogy, as it is homologous (shared due to ancestry) between the two groups.

In a Comparison of Birds and Mammals, the Condition of Having