One-quarter of vertebrates die because of humans. Scientists analyzed the deaths of 42,755 animals that were reported in 1,114 published studies. They found that 28 percent of the animals' deaths were directly caused by humans.

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One-quarter of vertebrates die because of humans. Scientists analyzed the deaths of 42,755 animals that were reported in 1,114 published studies. They found that 28 percent of the animals' deaths were directly caused by humans.