Assertion: grizzly bear | /r/CapableOf | mate with polar bear
Facets:
value: in two different years
type: TEMPORAL
Source sentences:
text: Two male grizzlies mated with the female polar bear to give rise to the four F1s, with one grizzly bear apparently mating with the polar bear in two different years (two of the F1s are full siblings, but born three years apart).