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Peter P. Marra is dean of the Earth Commons Institute and the Laudato Si’ Professor of Biology and the Environment at Georgetown University. His books include Cat Wars: The Devastating Consequences of a Cuddly Killer (Princeton) and Birds of Two Worlds: The Ecology and Evolution of Migration. Amy L. Scarpignato is an ecologist and bird conservation specialist at Smithsonian’s National Zoo and Conservation Biology Institute, Migratory Bird Center.
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