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Describe the similarities and differences between a bats wing and a birds wing.

User Opyh
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Bat wings and bird wings are analogous as flight structures: their structure and function have evolved by different routes from a flightless reptilian ancestor. Note for example that a good portion of the flight surface in bats consists of a membrane stretched between the extended digits (chiropatagium), whereas the digits of the bird are relatively small and do not support the flight surface.
User Runcorn
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