During food competition experiments, male bonobos change their cortisol levels (increasing when a dominant partner is expected to monopolize food and decreasing when food is expected to be shared), whereas male chimpanzees change their testosterone levels instead.
Notes on verification
Confirmed by original peer-reviewed PNAS study (Wobber et al. 2010) and corroborated by multiple independent science journalism sources with consistent details. [cascade flags: aggregator_dropped_primary_exists | tier=silver indep_score=1.0 clusters=3 claim_tier=notable]
Sources
- Comparative Cognitive Development (seed:psychology_and_neuroscience)
- https://www.pnas.org/doi/10.1073/pnas.1007411107 (corroboration)
- https://pubmed.ncbi.nlm.nih.gov/20616027/ (corroboration)
- https://today.duke.edu/2010/06/bonobo_hormone.html (corroboration)