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Species Basics lessons
Start here - what dinosaurs were, how to recognize them, and major groups.
5 min / Updated May 18, 2026
What Is a Dinosaur?
Not every prehistoric reptile was a dinosaur. Here's how scientists tell the difference.
Dinosaur basicsSpecies explainersBirds and dinosaurs
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4 min / Updated May 17, 2026
The Biggest Dinosaurs
Sauropods like Argentinosaurus and Patagotitan were so big it's hard to picture.
Species explainersSauropodsDinosaur biology
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