Does hierarchy stability influence testosterone and cortisol levels of bearded capuchin monkeys (Sapajus libidinosus) adult males?: A comparison between two wild groups - Mendonça-Furtado, Olívia; Izar, Patricia; Edaes, Mariana; Rodrigues, Agatha; Siqueira, José; Palme, Rupert (Behavioural Processes, 2014)