This page features lists of species and organisms that have become extinct. The reasons for extinction range from natural occurrences, such as shifts in the Earth's ecosystem or natural disasters, to human influences on nature by hunting and destruction of natural habitats.
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A species is presumed to be extinct after surveys of its expected and historical habitat demonstrates an inability to locate an individual. [1] Species which meet this criteria but are known to be kept in captivity are extinct in the wild. If a final specimen of a moribund species is found, it is an endling.
