Chimpanzee (Pan troglodytes) and tufted capuchin monkey (Sapajus apella) infants can take several years to master nut cracking, a skill learned while observing their mothers.
Notes on verification
Corroborated by multiple independent long-term field studies (Taï Forest chimpanzees, Brazilian bearded capuchins) published in peer-reviewed journals, consistent with established primatology consensus on prolonged tool-use learning periods.
Sources
- Organized to learn: the influence of social structure on ... - Cell Press (cell.com)
- https://www.pnas.org/doi/10.1073/pnas.1518355113 (pnas.org)
- https://royalsocietypublishing.org/doi/10.1098/rsos.161504 (royalsocietypublishing.org)
- https://www.sciencedirect.com/science/article/abs/pii/S0003347294710178 (sciencedirect.com)