Nazca boobies clutch one or two eggs but usually only one hatches and survives. The Nazca booby, like its relatives, practices siblicide; however, it takes siblicide to a whole different level. While the female typically lays two eggs, the parents never raise two young. The first egg is normally laid four to nine days before the other. This delay is a death sentence for the second chick that hatches, as the first can easily push it out of the nest, and it does so in every case, without fail. Once outside of the nest, the parents do not acknowledge the unwanted chick and it quickly dies from either starvation, temperature change or predation.The Nazca Booby is an annual breeder; however, its breeding period varies depending on where the colony is located. ... As they do not have a brood-patch, they use their large webbed feet to incubate the egg for approximately 40 days.