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Animal extinction refers to the permanent disappearance of species as a result of natural events, human activities, or a combination of both. It is characterized by the loss of animals that once inhabited various regions and ecosystems, altering biological diversity and ecological balance. The Great Auk, for instance, was a flightless seabird endemic to the North Atlantic that went extinct in the mid-19th century due to overhunting and habitat destruction. This category encompasses the study of vanished species, the factors contributing to their demise, and efforts to conserve remaining populations and prevent further losses.