Dinosaur
공룡
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<speciesfyi-glossary slug="dinosaur"></speciesfyi-glossary>Definition
A diverse group of reptiles that dominated terrestrial ecosystems for over 160 million years during the Mesozoic Era.
Detailed Explanation
Birds are the only living dinosaurs — they descended from theropod dinosaurs and retain dinosaurian features including hollow bones, scales on feet, and egg-laying. Non-avian dinosaurs ranged from the chicken-sized Microraptor to the 70-tonne Argentinosaurus. Their dominance for 160 million years reflects extraordinary ecological versatility. The asteroid impact 66 million years ago triggered mass extinction, but the avian lineage survived, diversifying into over 10,000 living species.