Assertion: meerkat's role | /r/HasProperty | altruistic
Facets:
value: for quite some time
type: TEMPORAL
Source sentences:
text: The role of the sentinel had been thought to be altruistic for quite some time before Clutton-Brock et al 1999b published research that proposed meerkats who take on the role of sentinel are actually doing so in order to serve their own interests.