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Mass extinctions of land-dwelling animals–including amphibians, reptiles, mammals, and birds — follow a cycle of about 27 million years, coinciding with previously reported mass extinctions of ocean life, according to a new analysis.
Mass extinctions of land-dwelling animals–including amphibians, reptiles, mammals, and birds — follow a cycle of about 27 million years, coinciding with previously reported mass extinctions of ocean life, according to a new analysis.