1. Nazca Booby (Sula granti) is a booby found primarily on the Galápagos Islands. It is known for practicing obligate siblicide. The female lays two eggs, several days apart. If both eggs hatch, the elder chick will push its sibling out of the nest area. The parent booby will not intervene and the younger chick will inevitably die.

    Photo: Benjamint444

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