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