Dinosaurs were a diverse group of reptiles that dominated Earth for approximately 165 million years. First appearing around 245 million years ago during the Triassic period, these remarkable creatures ranged from small, agile species to massive herbivores and fearsome predators. Evolving to fill various ecological niches across the planet. Journey back 300 million years and explore the world of archosaurs and dinosaurs. Learn about how fossils provide crucial information about these ancient creatures, including their physical characteristics, behaviors, and diets. Discover the key differences between archosaurs and dinosaurs, and how features like locomotion and teeth offer insights into their lifestyles. Examine various defensive adaptations, dinosaurs developed, from armor to horns, highlighting the remarkable diversity of these prehistoric reptiles. This journey through time reveals how paleontologists piece together the fascinating story of Earth’s dominant land animals for over 165 million years.