Assertion: hyena's system | /r/HasProperty | unique
Facets:
value: among mammals
type: OTHER
value: entirely
type: DEGREE
Source sentences:
text: As the BBC points out, a spotted hyena's reproductive system is entirely unique among mammals (the females have organs that more closely resemble the male organs in most animals, as they possess no vaginal opening).
text: For one, hyenas possess unique immune systems that allow them to withstand diseases that kill other animals.