Dinosaurs were ancient reptiles that ruled the Earth for over 160 million years. These incredible creatures lived during the Mesozoic Era, which included the Triassic, Jurassic, and Cretaceous periods. Ranging from small, feathered predators to massive, long-necked herbivores, dinosaurs displayed remarkable diversity. Some, like the Tyrannosaurus rex, were fierce carnivores, while others, such as the Triceratops and Stegosaurus, were plant-eaters with unique defenses. Fossils reveal their fascinating adaptations, including armored plates, sharp claws, and powerful tails. Although most dinosaurs went extinct about 65 million years ago, their legacy lives on through modern birds, which evolved from theropod ancestors. Paleontologists continue uncovering new dinosaur species, deepening our understanding of these prehistoric giants that once dominated the planet. Their enormous size and extraordinary features make them a constant source of wonder and scientific study.