Tubbataha Reefs Natural Park rangers discovered an unusual sight last week on Bird Islet and South Islet—brown boobies nesting on four eggs, a rare occurrence in the species. Typically, boobies lay one or two eggs, with three considered unusual.
“The seabirds just reminded us again that nature will forever keep us guessing,” the Tubbataha Management Office (TMO) said in a Facebook post.
“While doing their rounds over a week ago, the rangers found something we had never seen before in Tubbataha—Brown Boobies sitting on four eggs.”
According to TMO, even if all eggs are fertile, boobies rarely raise more than one chick. In many cases, the strongest chick survives while the others are pushed out, a natural behavior called siblicide.
“This makes the discovery of four eggs even more remarkable,” the post added.
Scientists and ornithologists suggest several possible explanations for the four eggs, including egg dumping, nest takeovers, double clutching if earlier eggs were infertile, or simply a rare natural variation.
“But nature sometimes leaves us all scratching our heads. She has her secrets and her own way of surprising us all,” the Tubbataha post noted.
Rangers will continue monitoring the nests, recording observations, and studying the birds’ behavior.
