Based on the extinctions of birds and mammals known to have occurred over the last 400 years, human actions seem to have

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Studies have shown that human actions, such as deforestation, hunting, and habitat destruction, have greatly increased extinction rates in birds and mammals compared to the usual or "background" rates of extinction found in the fossil record. Some estimates suggest that extinction rates for these groups may be 100 to 1,000 times higher than normal.

Based on the Extinctions of Birds and Mammals Known to Have