The village of Elm, from which historical parish data have been used. Image Erik Postma, University of Exeter Reference: Mark Spa, Euan A. Young, Virpi Lummaa, Erik Postma and Hannah L. Dugdale. Age- and sex-dependent associations between the number of older siblings and early-life survival in pre-industrial humans. Proceedings of the Royal Society B: Biological Sciences. 3 september 2025.

📖 What can old Swiss parish records tell us about #siblingsurvival? Researchers @rug.nl found older brothers 👦 close in age reduced sisters’ survival, while older sisters 👧 helped both sexes.

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Study in @royalsocietypublishing.org