1. Harold Mooney is a professor in the Department of Biology at Stanford University, Stanford, CA 94305, USA, and chair of the Science Committee of DIVERSITAS, Maison Buffon 57, rue Cuvier-CP 41, 75231 Paris, Cedex 05, France.
2. Georgina Mace is a professor in the Division of Biology at Imperial College London, Silwood Park, Ascot SL5 7PY, UK, and vice-chair of the Science Committee of DIVERSITAS.