Assertion: contagious yawning | /r/AtLocation | chimpanzee
Facets:
Source sentences:
text: This "contagious" yawning has also been observed in chimpanzees, dogs, cats, birds, and reptiles and can occur between members of different species.
text: This same contagious yawning has been observed in chimpanzees and dogs.
text: This "contagious" yawning has also been observed in chimpanzees, dogs, cats, birds, and reptiles, and can occur across species.
text: This "contagious" yawning has also been observed in chimpanzees, dogs, cats, birds, and reptiles, and can occur across species.
text: Contagious yawning has been observed in dogs and chimpanzees.