Alex Mustard / Male Bullethead parrotfish (Chlorurus sordidus) displaying in late afternoon. Ras Katy, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Jeff Rotman / Pectoral fin of a Steepheaded parrotfish (Chlororus gibbus) in the Red Sea, Egypt.

Jeff Rotman / Bullethead parrotfish (Chlororus sordidus) tail. Red Sea, Egypt

Jeff Rotman / Bullethead Parrotfish (Scarus sordidus) portrait at night. Egypt, Red Sea.

Pascal Kobeh / Parrotfish (Scarus / Chlorurus sp.) sleeping at night, New Caledonia, Pacific Ocean.

Linda Pitkin / Red Sea steephead parrotfish (Heavybeak parrotfish) Chlorurus gibbus, on coral reef Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Alan Murphy/ BIA / Green-tailed Towhee (Pipilo chlorurus), Texas

Alex Mustard / Bullethead parrotfish (Chlorurus sordidus) male, close up of eye, whilst sleeping at night. The Alternatives, Sinai, Egypt. Red Sea

Alan Murphy/ BIA / Green-tailed Towhee (Pipilo chlorurus) calling, New Mexico

Alan Murphy/ BIA / Green-tailed Towhee (Pipilo chlorurus), New Mexico

Pete Oxford / Daisy Parrotfish (Chlorurus sordidus) caught in net of fisherman, Half Island, Cenderawasih Bay, West Papua, Indonesia

Georgette Douwma / Steepheaded parrotfish (Scarus gibbus). Egypt, Red Sea.