Assertion: dusky dolphin | /r/HasProperty | hard
Facets:
value: often
type: DEGREE
value: to study these animals
type: PURPOSE
Source sentences:
text: Despite being relatively wide-spread across the southern hemisphere, the fast moving nature of the Dusky Dolphin has meant that it can often be hard to study these animals in the wild and quite little is therefore known about their lifespans in general.