Galapagos Islands, Ecuador

Saturday, February 12, 2005

A Nazca booby lays 2 eggs. The 2nd one is just an insurance in case the first egg does not hatch. The 2nd egg is laid 4-5 days after the 1st one. If the 1st chick is born, the booby feeds. When the 2nd chick is born, the 1st chick pecks and kills the 2nd chick. The parents watch the sibling rivalry. In over 90% of the cases, the 2nd chick is killed by its elder sibling.


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