Assertion: gorilla's group | /r/HasProperty | smaller than 20 individuals
Facets:
Source sentences:
text: The maximum group size for mountain gorillas can exceed 20 individuals, while eastern and western lowland gorillas generally are not found in groups larger than 17 to 20 individuals and western lowland gorilla groups are always observed in groups smaller than 20 individuals (Yamagiwa et al. 2003).