Compared to other species of boobies such as the blue-footed booby, siblicide always happens in the masked booby. One reason is because the masked boobies build very shallow flat nests, so older chicks can expel their younger siblings with relative ease. Blue-footed booby parents, meanwhile, build nests with steeper sides, thus preventing some older chicks from engaging in siblicidal behaviour.= = = Great cormorant = = =
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