Assertion: impala | /r/CapableOf | lift their heads
Facets:
value: by having peripheral vision
type: MANNER
value: to check the area
type: PURPOSE
Source sentences:
text: If impalas were to have binocular vision they wouldn’t be able to see what is creeping up on them as when they are grazing their heads are lowered, they do lift their heads to check the area but, by having peripheral vision they can graze and see if there is anything stalking them.