Assertion: captive chimpanzee | /r/HasProperty | taught sign language
Facets:
Source sentences:
text: Chimpanzees communicate in many ways: verbal communication with up to 34 different vocalizations, facial gestures such as showing teeth as a sign of aggression, body language such as involuntary piloerection (hair standing erect) showing excitement, and captive chimpanzees have even been taught sign language.