Assertion: black lemur | /r/HasProperty | purr
Facets:
Source sentences:
text: Among the sounds they use are: a cohesion call, used to keep track of other group members; a recognition grunt, used when one lemur identifies another (and which sounds somewhat like a duck's quacking!); a purr, used by infants to indicate contentment while being groomed; and an alarm call, used to warn of predators (such as birds of prey or the fossa, a type of civet).