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Re: four winged Archaeopteryx

Ronald Orenstein wrote:

Well, it depends what you mean by "fully-developed", but the Kagu of New Caledonia, which is all but flightless, has large, strongly-patterned wings that are used in display.

By "all but flightless" I'm guessing you're referring to the fact that the kagu is capable of gliding, such as during short descents. Useless for take-offs or powered flight - which is why the kagu is threatened with extinction due to predation by introduced mammals.