Pete Marra, head of the Smithsonian Migratory Bird Center, talks about the threats free-ranging cats pose to biodiversity and public health throughout the world, and proposes possible solutions to this thorny problem. Marra’s new book, Cat Wars: The Devastating Consequences of a Cuddly Killer, covers mounting scientific evidence that in the U.S. alone, free-ranging cats are killing birds and other animals by the billions. For more information, see our FAQ page, Outdoor Cats And Their Effects On Birds.

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