Stock Photo - Priest-hat urchin (Tripneustes gratilla), detail. Between 10 and 15 cm wide. Colour of the spines varies some are only partly orange, or completely white. Grazes continually, day and night, eating about a quarter of seagrass produced in a year. Tulamben, Bali, Indonesia

Stock Photo: Priest-hat urchin (Tripneustes gratilla), detail. Between 10 and 15 cm wide. Colour of the spines varies some are only partly orange, or completely white.

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