What proportion of all known avian species does the Order Passeriformes contain?
Answer
More than half.
The Order Passeriformes represents the largest and most diverse grouping within the avian family tree. It encompasses significantly more bird species than any other order, specifically accounting for more than half of all known avian species documented worldwide. This vast representation highlights the ecological and evolutionary success of the traits defining this group, particularly the specialized perching foot structure that allows them to exploit a wide range of niches.
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