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The Origin of Dinosaurs and Birds

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Published on Sep 13, 2015

Paleontologists have unearthed and studied hundreds of dinosaur
fossils on every continent. We know dinosaurs laid eggs, traveled
in herds and hunted in packs.

The first dinosaurs are known from the Late Triassic. By then they had already diversified. So their origins must have been earlier.

The ancestry of dinosaurs has been difficult to ascertain. Traditional paleontologists have nested lagerpetids, pterosaurs and silesaurs close to dinosaurs, but the large reptile tree (now 575 taxa and growing) at ReptileEvolution.com does not confirm those results.

Here, going back to basal tetrapods is the lineage of dinosaurs, using the closest known sister taxa and documented with a gradual accumulation of dinosaurian traits. This lineage takes you through the stem reptiles, the basal reptiles, the protodiapsids, the diapsids, the archosauriforms, the archosaurs and finally the basal dinosaurs from which all others, including birds, evolved.

Look for other YouTube videos that document the origin of pterosaurs and the origin of turtles in a similar fashion.

More details can be found at ReptileEvolution.com

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