Two Independent Extentions Of Flight Evolution

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Vertebrates have two independent extentions of flight evolution. These two evolutionary markers are the aves, and chiroptera. The origin of flight led to two main theories that flight originated form the ground up or from the trees down. One theory does not explain both evolution in flight as it may be possible that the trees down theory supports Chiroptera or bat evolution. The other theory of ground up evolution could be the explanation for Aves or birds. Aves flight origin is believed to have began with the ancestor Archaeopteryx in the late Jurassic era. Chiroptera origin traces back to early Eocene period but a small fossil record is not helpful to establish their origin. Studies show that Skeletal and muscle structure differences could

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