Increasingly, Animals Dying from Human Diseases Diseases often jump from animals to humans, such as the West Nile virus or AIDS. But scientists now believe wild animals are increasingly dying from human diseases. Hear NPR's John Nielsen.

Increasingly, Animals Dying from Human Diseases

Increasingly, Animals Dying from Human Diseases

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Diseases often jump from animals to humans, such as the West Nile virus or AIDS. But scientists now believe wild animals are increasingly dying from human diseases. Hear NPR's John Nielsen.