David Fleetham / Hawaiian cleaner wrasse (Labroides phthirophagus) cleaning Redlip parrotfish (Scarus rubroviolaceus) in coral reef. Kauai, Hawaii.

David Fleetham / Redlip Parrotfish (Scarus rubroviolaceus) in its initial phase (before becoming a late-stage male). Hawaii.

Pascal Kobeh / Female Ember parrotfish (Scarus rubroviolaceus) sleeping at night. Maldives, Indian Ocean.

Franco Banfi / Bicolor parrotfish (Scarus rubroviolaceus) Cocos Island National Park, Costa Rica, East Pacific Ocean

Pascal Kobeh / Female Ember parrotfish (Scarus rubroviolaceus) feeding on coral, Maldives. Indian Ocean.

Pascal Kobeh / Head of a female Ember parrotfish (Scarus rubroviolaceus) at night, Maldives. Indian Ocean.

Franco Banfi / Ember parrotfish (Scarus rubroviolaceus) Maldives, Indian Ocean

Georgette Douwma / Redlip parrotfish (Scarus rubroviolaceus) grazing on coral rock. Rinca, Komodo National Park, Indonesia.

Pete Oxford / Bicolor Parrotfish (Scarus rubroviolaceus) Wolf Island in the northern archepelago, Galapagos Islands, Equador, South America

Fred Bavendam / Redlip Parrotfish (Scarus rubroviolaceus) cleaned by Clear Cleaner Shrimp (Urocaridella antonbruunii), Bali, Indonesia

Fred Bavendam / Redlip Parrotfish (Scarus rubroviolaceus) mouth showing teeth, Indonesia

Pete Oxford / Redlip parrotfish (Scarus rubroviolaceus) off Wolf Island in the northern archepelago, Galapagos Islands, Ecuador, South America

Pete Oxford / Redlip parrotfish (Scarus rubroviolaceus) off Wolf Island in the northern archepelago, Galapagos Islands, Ecuador, South America

Pete Oxford / Redlip Parrotfish (Scarus rubroviolaceus), Wolf Island, Galapagos Islands, Ecuador

Dan Burton / Redlip parrotfish {Scarus rubroviolaceus} resting on coral reef, Red Sea

Fred Bavendam / Redlip Parrotfish (Scarus rubroviolaceus) female, sleeping in a Gorgonian Sea Fan at night, Andaman Sea, Thailand

Tui De Roy / Redlip Parrotfish (Scarus rubroviolaceus) swimming over corals, Roca Redonda, Galapagos Islands, Ecuador

David Fleetham / Red lip parrotfish (Scarus rubroviolaceus) resting on coral, Thailand.

Pete Oxford / Redlip Parrotfish (Scarus rubroviolaceus) scales, Raja Ampat Islands, Indonesia

Pete Oxford / Redlip Parrotfish (Scarus rubroviolaceus) scales, Raja Ampat Islands, Indonesia

Pete Oxford / Redlip Parrotfish (Scarus rubroviolaceus) eye, Raja Ampat Islands, Indonesia

Pete Oxford / Redlip Parrotfish (Scarus rubroviolaceus) feeding on coral, Raja Ampat Islands, Indonesia

David Fleetham / Redlip parrotfish (Scarus rubroviolaceus) in initial female phase, defacating sand after grinding up coral polyps and digesting the algae within them, Hawaii, Pacific Ocean.

Alex Mustard / Redlip parrotfish (Scarus rubroviolaceus) sleeps in a coral reef at night. Parrotfish sometimes make mucus cocoons to enclose their body while they sleep, but not always, as here. Misool, Raja Ampat,...