The anatomy of the face of an Orangutan
From Untersuchungen über die Gesichtsmuskulatur der Primaten (Studies on the facial muscles of Primates)
chimpanzees’ contagious yawning evidence of empathy, not just sleepiness, study shows.
"The idea is that yawns are contagious for the same reason that smiles, frowns and other facial expressions are contagious," they write. "Our results support the idea that contagious yawning can be used as a measure of empathy, because the biases we observed were similar to empathy biases previously seen in humans."
"The authors say that contagious yawning could be a window into social and emotional connections between individuals, and suggest that insight into barriers to chimpanzee empathy may help break down those barriers for humans."
posted in science daily