DAVID LIITTSCHWAGER, the Richard Avedon of obscure but beautiful creatures, has shot more than a dozen assignments for National Geographic, primarily specializing in portraiture of natural history subjects. He has published or contributed to six books as well as Scientific American, Audubon, and other magazines. Liittschwager's photography has been exhibited at major museums including at the American Museum of Natural History in New York City and the National Academy of Sciences in Washington, D.C. He lives in San Francisco. Instagram: @davidliittschwager. ELIZABETH KOLBERT won the 2015 Pulitzer Prize for her book The Sixth Extinction, and has been recognized with several other awards for her writing in National Geographic, the New York Times, and the New Yorker, as well as a previous book, Field Notes From a Catastrophe. JENNIFER HOLLAND is a senior science writer for National Geographic magazine and a New York Times best-selling author of the Unlikely Friendships books. OLIVIA JUDSON is an evolutionary biologist and author of the bestseller Dr. Tatiana's Sex Advice to All Creation.