A cursorial, or "running" model was originally proposed by Samuel Wendell Williston in 1879.
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The term Proavis was used again in 1999, when Joseph Garner, Graham Taylor, and Adrian Thomas proposed their "pouncing proavis model", an hypothesis entailing that the origin of avian flight rested in a predatory behaviour, the "proavis" jumping on its prey from trees (see pouncing proavis model in Origin of avian flight).