• Circadian rhythms of urinary cortisol levels vary between individuals in wild male chimpanzees: A reaction norm approach 

      Sonnweber, Ruth; Araya-Ajoy, Yimen; Behringer, Verena; Deschner, Tobias; Tkaczynski, Patrick; Fedurek, Pawel; Preis, Anna; Samuni, Liran; Zommers, Zinta; Gomes, Cristina; Zuberbühler, Klaus; Wittig, Roman M.; Crockford, Catherine (Journal article; Peer reviewed, 2018)
      Investigating the repeatability of trait variation between individuals, that is the amount of individual variation in relation to overall phenotypic variation, indicates an upper level of heritability and reveals whether ...