Tony Wu / Humphead parrotfish (Bolbometopon muricatum) shoal spawning in early morning, part of mass aggregation of thousands of fish. Caroline Islands, Palau.

Michael Pitts / Bicolour parrotfish (Cetoscarus bicolor) sleeping at night, Red Sea.

Juergen Freund / Large schooling Bumphead parrotfish (Bolbometopon muricatum) with a passing Hawksbill turtle (Eretmochelys imbricata). Sipadan Island, Sabah, Malaysia

Georgette Douwma / Bumphead parrotfish (Bolbometopon muricatum) Malaysia.

Doug Perrine / Shoal of Giant bumphead parrotfish {Bolbometopon muricatum} Sipadan, Malaysia

David Fleetham / Bumphead parrotfish (Bolbometopon muricatum), Yap, Micronesia.

Tony Wu / Bicolor parrotfish (Cetoscarus bicolor) juvenile with tail fin flared open, Kokopo, Little Pigeon Island, Papua New Guinea

Georgette Douwma / Two-colour / Bicolor parrotfish (Cetoscarus bicolor) female, Raja Ampat, West Papua, Indonesia.

Georgette Douwma / Two-colour / Bicolor parrotfish (Cetoscarus bicolor) juvenile, Raja Ampat, West Papua, Indonesia.

Alex Mustard / Bumphead parrotfish (Bolbometopon muricatum) gather at dawn on a shallow coral reef. Sipadan Island, Sabah, Borneo, Malaysia. Celebes Sea. Vulnerable species.

Juergen Freund / Bumphead parrotfish (Bolbometopon muricatum) shoal. Sipadan Island, Sabah, Borneo.

Pascal Kobeh / Group of Humphead parrotfish (Bolbometopon muricatum) swimming above coral reef, Sudan. Red Sea.