Technicality: Of course, dinosaurs aren't technically extinct anyway; all of the birds we know and love are dinosaurs, too! (Don't believe me? Click here!)
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Crocs and alligators aren't dinosaurs, they're in the totally separate group Crocodilia :') They're sometimes referred to as living reminders of the dinosaur era because they evolved and lived alongside the dinosaurs, and survived the extinction event, but they are very separate groups of animals c: Birds on the other hand are direct dinosaur descendents that survived, and they're still classified in the Dinosauria group!