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Avimimus  — Research Starter

Avimimus is a small, omnivorous dinosaur that lived during the Late Cretaceous period in what is now Mongolia. Belonging to the family Avimimidae and classified under the order Saurischia, Avimimus is…

Archosauria  — Research Starter

Archosauria, often referred to as archosaurs, is a significant group of reptiles that includes dinosaurs, pterosaurs (flying reptiles), and crocodylomorphs (alligators and crocodiles), along with…

Anatotitan  — Research Starter

Anatotitan is a large herbivorous hadrosaurid, commonly referred to as a duck-billed dinosaur, that inhabited Late Cretaceous North America, a period noted for its diverse dinosaur species. The…

Anapsids, Synapsids, and Diapsids  — Research Starter

Anapsids, synapsids, and diapsids represent three key groups of amniotes, a class of vertebrates that evolved the amniotic egg around 310 million years ago during the Carboniferous Period. Anapsids,…

Ammosaurus  — Research Starter

Ammosaurus is an early dinosaur species, discovered in 1884 in the northeastern United States, that measures approximately 4 meters (13 feet) long and weighs up to 400 kilograms (882 pounds). Its…

Amargasaurus  — Research Starter

Amargasaurus is a small sauropod dinosaur that lived during the Early Cretaceous period, primarily in what is now Patagonia, Argentina. Weighing between 3 to 5 tons and reaching heights of up to 4…

Afrovenator  — Research Starter

Afrovenator, meaning "African Hunter," is a large predatory dinosaur that lived during the Early Cretaceous period in what is now North Africa. This dinosaur is primarily known from a single, nearly…

Abelisaurus  — Research Starter

Abelisaurus is a genus of theropod dinosaur that was first discovered in 1985 from a partial fossil skull found in southern Argentina's Late Cretaceous rock formations. It belongs to the family…

XMM-Newton (satellite)  — Research Starter

XMM-Newton is a significant X-ray observatory satellite launched by the European Space Agency on December 10, 1999. It was the largest satellite developed by the agency and was named in honor of the…