1. Department of Zoology University of Oxford South Parks Road Oxford OX1 3PS UK
2. Department of Public Health Max‐Planck Odense Center on the Biodemography of Aging University of Southern Denmark J.B. Winsløws Vej 9B, 5000 Odense C Denmark
3. Max Planck Institute for Demographic Research Konrad‐Zuse‐Str. 1 18057 Rostock Germany
4. Department of Ecology, Evolution and Behavior University of Minnesota 1987 Upper Buford Circle Saint Paul Minnesota 55108
5. Department of Mathematics and Computer Science Max‐Planck Odense Center on the Biodemography of Aging University of Southern Denmark Campusvej 55 5230 Odense M Denmark