Assertion: booby's chick | /r/HasAspect | a four day
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Source sentences:
text: It also never mentions an important fact about egg incubation leading to siblicide: that boobies start incubating their first egg four days before the next one, so the first chick has a four day’s advantage over its younger sibling, meaning that it is dominant in the nest and can attack the younger one when there is not enough food.