Birds descended from theropod dinosaurs by the Late Jurassic, but our understanding of the earliest evolution of the Avialae, the clade comprising all modern birds but not Deinonychus or Troodon, has been hampered by a limited diversity of fossils from the Jurassic.
, named Fujianvenator prodigiosus, exhibits a bizarre assembly of morphologies that are shared with other avialans, troodontids, and dromaeosaurids, showing the impact of evolutionary mosaicism in early bird evolution.
The surprisingly elongated lower leg and other morphologies, in combination with other geological observations, suggest that Fujianvenator lived in a swamp-like environment and was a high-speed runner or a long-legged wader, representing a previously unknown ecology for early avialans. Morphometric space of body plan and cursoriality of Fujianvenator prodigiosus, compared with other Mesozoic theropods. Credit: Wang Min
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