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Quetzalcoatlus (/ k ɛ t s əl k oʊ ˈ æ t l ə s /) is a genus of azhdarchid pterosaur that lived during the Maastrichtian age of the Late Cretaceous in North America. The type specimen, recovered in 1971 from the Javelina Formation of Texas, United States, consists of several wing fragments and was described as Quetzalcoatlus northropi in 1975 by Douglas Lawson.
The size of Hatzegopteryx was initially estimated by comparing the 236 mm (9.3 in) humerus fragment with that of Quetzalcoatlus northropi, which has a 544 mm (21.4 in)-long humerus. Observing that the Hatzegopteryx fragment presented less than half of the original bone, Buffetaut and colleagues established that it could possibly have been ...
A related problem is the origin of pterosaur flight. [140] Like with birds, hypotheses can be ordered into two main varieties: "ground up" or "tree down". Climbing a tree would cause height and gravity to provide both the energy and a strong selection pressure for incipient flight.
Azhdarchidae (from the Persian word azhdar, اژدر, a dragon-like creature in Persian mythology) is a family of pterosaurs known primarily from the Late Cretaceous Period, though an isolated vertebra apparently from an azhdarchid is known from the Early Cretaceous as well (late Berriasian age, about 140 million years ago). [1]
The fastest animal in flapping horizontal flight may be the Mexican free-tailed bat, said to attain about 160 kilometres per hour (99 mph) based on ground speed by an aircraft tracking device; [24] that measurement does not separate any contribution from wind speed, so the observations could be caused by strong tailwinds. [25] Slowest.
Lawson's discovery of the remains of Quetzalcoatlus northropi caused scientists to rethink both the evolution of flight and the habitats of giant fliers. [ citation needed ] Lawson appears in Sir David Attenborough 's motion picture documentary, Flying Monsters 3D (2010), discussing the impressive wingspan of Quetzalcoatlus and how estimates of ...
British Airways Flight 216 reached a top speed of 809 mph Sunday and landed at London Heathrow 20 minutes early after departing its gate at 6:38 p.m., FlightAware data shows.
Quetzalcoatlus northropi 10–11 m (33–36 ft) [3] [5] Cryodrakon boreas 10 m ... Speculation about pterosaur size and flight. Size comparison of Tropeognathus.