These coy hippos come from a 19th century illustration in The Proceedings of the Zoological Society of London. They're now part of a new book, published by New York's American Museum of Natural History, that combines some of the best illustrations and artworks from the museum's rare book collection. Looks like a great read!
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.