Paul D. Taylor worked for almost forty years at the Natural History Museum, London, where he is now a Scientific Associate. His research focuses on fossil and living bryozoans, with interests in evolution, paleoecology, and fossil folklore. Aaron O'Dea is a Scientist at the Smithsonian Tropical Research Institute in Panama. He uses the fossil record to understand past climactic changes in the seas and their role in extinction and speciation, and how life in the past can help us predict the future.