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Extinct Animals refers to species that have completely died out and no longer exist on Earth. This category is a subset of Endangered Species, which includes animals that are at risk of becoming extinct due to factors such as habitat loss, overhunting, or climate change. The term "Extinct Animals" also encompasses Fossil Animals, which refers to the remains or impressions of prehistoric organisms preserved in petrified form or as a mold or cast in rock. Additionally, this category includes birds that have gone extinct. Extinct animals no longer play their roles in ecosystems and are important for understanding the history of life on Earth.