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Origin of avian flight
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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 mi
The Berlin Archaeopteryx, one of the earliest known birds.
The Berlin Archaeopteryx, one of the earliest known birds.
Proavis
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Proavis is a hypothetical extinct species or hypothetical extinct taxon. The term was coined in the early 20th century in an attempt to support and explain the hypothetical evolutionary steps and anat
Origin of avian flight
…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…
Hypothetical restoration of "one of the Pro-Aves", as shown at the British Museum by William Plane Pycraft in 1906 (here extracted from Pycraft 1910 b
Hypothetical restoration of "one of the Pro-Aves", as shown at the British Museum by William Plane Pycraft in 1906 (here extracted from Pycraft 1910 book A History of Birds).
Illustration of "a running Pro-Avis" as envisioned by Franz Nopcsa in 1907 after having seen the Pycraft restoration "One of the Pro-Aves".
Illustration of "a running Pro-Avis" as envisioned by Franz Nopcsa in 1907 after having seen the Pycraft restoration "One of the Pro-Aves".
A hypothetical "Tetrapteryx", as imagined by William Beebe (1915).
A hypothetical "Tetrapteryx", as imagined by William Beebe (1915).
Gerhard Heilmann's arboreal vision of Proavis (1916).
Gerhard Heilmann's arboreal vision of Proavis (1916).