Extinct animals are species that no longer exist anywhere on Earth. This can happen due to various reasons, including habitat loss, climate change, and human activities. Famous examples of extinct animals include the dodo, a flightless bird, and the woolly mammoth, a large prehistoric elephant. The extinction of animals can have significant effects on ecosystems. Each species plays a role in its environment, and losing one can disrupt food chains and habitats. Conservation efforts aim to protect endangered species to prevent further extinctions and maintain biodiversity in our world.