Blue Footed Boobies - Naomi Blinick
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Boobies have asynchronous hatching, meaning the the first egg is produced (and thus first chick hatched) significantly earlier than subsequent eggs. This results in a size disparity between the chicks. The older chick will often harass the younger. This behavior is not stopped by the adults in the nest. Called facultative siblicide, it may result in the death of younger chicks, especially in times of food scarcity.