In this episode, Cambridge conservation scientist Andrew Balmford discusses the state of the world's birds; the US Fish and Wildlife Service's Rex Johnson talks about a new, strategic approach to conservation (both men were presenters at the recent conference "Conserving Birds in Human-Dominated Landscapes" at the American Museum of Natural History in New York City); and the Wildlife Conservation Society's Alan Rabinowitz describes his efforts to save the world's big cats. Plus, test your knowledge about some recent science in the news.

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