Many years ago animals which lived on the Earth and now not there.
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Dinosaur as there are not present in this era..
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Extinction happens when environmental factors or evolutionary problems cause a species to die out. ... To some extent, extinction is natural. Changes to habitats and poor reproductive trends are among the factors that can make a species' death rate higher than its birth rate for long enough that eventually, none are left.
e.g. Dinosaur :(
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