Guardian Nature School Team Contact Blog Project Noah Facebook Project Noah Twitter

A global community of nature enthusiasts
photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school

Star Coral

Favites petagona


Pic#1 shows close-up of the individual polyps, which are less than 1 cm in diameter. Pic#2 shows the whole colony. The polyps are usually closed during day time and opens up at night, showing its tentacles for feeding. A coral "group" is a colony of myriad genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in length. A set of tentacles surround a central mouth opening. An exoskeleton is excreted near the base. Over many generations, the colony thus creates a large skeleton that is characteristic of the species. Individual heads grow by asexual reproduction of polyps. Corals also breed sexually by spawning: polyps of the same species release gametes simultaneously over a period of one to several nights around a full moon.


Tropical reefs

Species ID Suggestions

Sign in to suggest organism ID


AlbertKang 5 years ago

Thanks, @venusflytrap2000 and @Leuba :)

Thanks too, @Ashley for the nomination.

Leuba Ridgway
Leuba Ridgway 5 years ago

My favourite Coral. Thanks for sharing this beauty ! I have embroidered this on a cushion cover - very intriguing.

AshleyT 5 years ago

Your spotting has been nominated for the Spotting of the Week. The winner will be chosen by the Project Noah Rangers based on a combination of factors including: uniqueness of the shot, status of the organism (for example, rare or endangered), quality of the information provided in the habitat and description sections. There is a subjective element, of course; the spotting with the highest number of Ranger votes is chosen. Congratulations on being nominated!

CalebSteindel 5 years ago

Great shots, Albert!

Spotted by

Cebu, Philippines

Spotted on Feb 28, 2016
Submitted on Mar 2, 2016

Noah Guardians
Noah Sponsors

Join the Project Noah Team Join Project Noah Team