Dinosaurs were a diverse group of reptiles that lived millions of years ago during the Mesozoic Era. They varied greatly in size, shape, and behavior. Some were massive, like the long-necked sauropods such as Brachiosaurus and Diplodocus, which could reach lengths of over 100 feet and weigh several tons. Others, like the fierce Tyrannosaurus rex, were apex predators with powerful jaws and sharp teeth.

Dinosaurs walked on two legs, like the iconic Velociraptor, or on four legs, like Triceratops and Stegosaurus. They lived in various habitats, from lush forests to vast plains, and they had different diets, including herbivores, carnivores, and omnivores.

Dinosaurs went extinct around 65 million years ago, likely due to a combination of factors such as climate change, asteroid impact, and volcanic activity. However, their descendants, birds, still thrive today. Dinosaurs continue to fascinate scientists and the public alike, offering glimpses into Earth's ancient past.