Higham, J. P., MacLarnon, A. M., Heistermann, M., Ross, C., & Semple, S. (2009). Rates of self-directed behaviour and faecal glucocorticoid levels are not correlated in female wild olive baboons (Papio hamadryas anubis). Stress: The International Journal on the Biology of Stress, 12(6), 526-532. https://doi.org/10.3109/10253890902756565