Wikipedia:Main Page history/2021 November 12b

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Mounted skeletons of Tyrannosaurus (left) and Apatosaurus (right)
Mounted skeletons of Tyrannosaurus (left) and Apatosaurus (right)

Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 million years ago; their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record demonstrates that birds are modern feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic epoch. As such, birds were the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event approximately 66 million years ago. Dinosaurs can therefore be divided into avian dinosaurs, or birds; and non-avian dinosaurs, which are all dinosaurs other than birds. (Full list...)

Today's featured picture

Saddle-billed stork

The saddle-billed stork (Ephippiorhynchus senegalensis) is a large wading bird in the stork family, Ciconiidae. The species has a widespread distribution in sub-Saharan Africa, and feeds on fish, frogs, crabs and other small creatures. This saddle-billed stork was photographed fishing in the shallow waters of the Okavango Delta in Botswana.

Photograph credit: Diego Delso

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