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Around 350 BCE, Aristotle and other philosophers of the time attempted to explain the aerodynamics of avian flight. Even after the discovery of the ancestral bird Archaeopteryx which lived over 150 million years ago, debates still persist regarding the evolution of flight. There are three leading hypotheses pertaining to avian flight. In the Pouncing Proavis model, it is assumed to have evolved from ambush predators pouncing on prey from above. The Cursorial model assumes that flight started with running dinosaurs making short leaps and evolving proto-wings for greater control over those leaps. The third hypothesis, the Arboreal model, assumes birds evolved from tree-dwelling gliders, who gradually increased their control and flight distance.
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