Dinosaurs were a diverse group of reptiles that dominated Earth's terrestrial ecosystems for over 160 million years. They are classified into two main clades based on their hip structure: Saurischia (lizard-hipped) and Ornithischia (bird-hipped). Here's an overview of some of the major types of dinosaurs in both categories:
### Saurischia
1. **Theropoda** (bipedal carnivores)
- **Tyrannosaurus rex** - One of the largest known land


