Alex Mustard / Portrait of face of male Slingjaw wrasse (Epibulus insidiator) Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Georgette Douwma / Slingjaw wrasse (Epibulus insidiator), male, with protractible jaw extended to form a tube which it uses to feed on small coral dwelling crustaceans and fishes. Sexually dichromatic species. Egypt, R...

Georgette Douwma / Slingjaw wrasse (Epibulus insidiator) male, sexually dichromatic species. Egypt, Red Sea.

Georgette Douwma / Slingjaw wrasse (Epibulus insidiator) male, sexually dichromatic species, Egypt, Red Sea.

Georgette Douwma / Slingjaw wrasse (Epibulus insidiator) female, sexually dichromatic species, Egypt, Red Sea

Georgette Douwma / Slingjaw wrasse (Epibulus insidiator) male, sexually dichromatic species, Egypt, Red Sea.

Georgette Douwma / Slingjaw wrasse (Epibulus insidiator) composite image showing female (top) changing into male (bottom)on black background. Egypt, Red Sea.

Georgette Douwma / Male Slingjaw wrasse (Epibulus insidiator) composite image showing its unique protractible jaw, used to feed on small coral dwelling crustaceans and fishes, on black background. Egypt, Red Sea.

David Fleetham / Sling-jaw wrasse (Epibulus insidiator), terminal male phase, swimming through coral, Yap, Micronesia, Pacific Ocean.

Alex Mustard / Female Slingjaw wrasse (Epibulus insidiator) swimming over hard corals (Pavona sp.), (Porites sp.) and (Pocillopora sp.) in shallow water, Jackson Reef, Sinai, Egypt, Red Sea.

Alex Mustard / Slingjaw wrasse (Epibulus insidiator) smaller female and larger male spawning above a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea