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Gender difference in benefits of twinning in pre-industrial humans: boys did not pay |
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| Authors: | Virpi Lummaa Jukka Jokela†‡ Erkki Haukioja‡ |
| Institution: | Large Animal Research Group, Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK;;Experimental Ecology, ETH-Zürich, ETH-Zentrum NW, CH-8092 Zürich, Switzerland;and;Section of Ecology, Department of Biology, University of Turku, FIN-20014 Turku, Finland |
| Abstract: | |
| Keywords: | food conditions litter size mortality reproductive success sex ratio |