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Pterosaurs: are an extinct clade of flying reptiles in the order Pterosauria and are the earliest vertebrates known to have evolved powered flight.
Quetzalcoatlus: is a genus of azhdarchid pterosaur. Quetzalcoatlus northropi has gained fame as a candidate for the largest flying animal ever discovered.
Deltopectoral crest: is a forward directed bony flange on the upper part of the humerus. It provided insertion surfaces for muscles of the shoulder and chest.
Postcranial pneumaticity: is the presence of air-filled cavities inside bones of the body (everything except the skull) that are connected to the respiratory system.
Quad Launch (also Quadrupedal launch): is a takeoff method where an animal launches into the air using all four limbs—both the hind legs and the forelimbs.
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