Assertion: whale | /r/HasAspect | a gestation period
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Source sentences:
text: Whales are marine mammals and like all mammals (with the exception of a few species) they share many of the same traits with land mammals including baring offspring (whales have a gestation period similar that is very similar to pregnancy in humans), being warm-blooded, having hair (some species are born with hair) and producing milk to feed their young.