Assertion: cormorant's feather | /r/CapableOf | fall off by the time incubation
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Source sentences:
text: The slender feathers on the sides of the head fall off by the time incubation has commenced, and do not appear during winter, as is alleged by authors when speaking of the crests or appendages of Cormorants, nor do they last more than a few weeks, as is also the case in the Egrets and Herons.