Chimpanzees yawn when observing an android yawn
Participants Participants were 14 adult chimpanzees (Pan troglodytes spp.) aged 10 to 33 years (\(\bar{X}\) = 22.57, SD = 8.06), including 10 males and 4 females (see Table 1). The chimpanzees had lived at the Fundació Mona (Spain) for between 1 and 12 years (\(\bar{X}\) = 7.36, SD = 4.34), after being confiscated or rescued from the pet and entertainment industry to be permanently housed at the centre. All chimpanzees were socially housed in two stable groups within a naturalistic enclosure de