Named for their parrot-like beak, the parrotfish consume either coral or the algae growing atop coral, grinding the coral to create sand that is then excreted (on average a single parrotfish produces 275g of sand a day). They also have an incredibly complex reproductive cycle, with sequential hermaphroditism (gender changing) based on life cycle or the gender ratio in a harem.
Soufrière Scotts Head Marine Reserve, Scott's Head, Commonwealth of Dominica

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Make:	Canon
Model:	Canon PowerShot D20
Exposure:	0.017 sec (1/60)
Aperture:	f/3.9
ISO Speed:	100
Focal Length:	5 mm
Lens:	5.0-25.0 mm