Assertion: estrus's estrus | /r/CapableOf | vary in duration
Facets:
value: among females of the same species
type: OTHER
Source sentences:
text: Both the menstrual cycle and estrus vary in duration somewhat among females of the same species.
text: Estrus varies in duration, as noted above, and it also varies in terms of how the females of different species behave when they are in estrus.