David Fleetham / Ring-tailed cardinalfish (Ostorhinchus aureus), male protecting and incubating eggs in mouth, Philippines.

Pascal Kobeh / Ring-tailed / Golden cardinalfish (Ostorhinchus aureus) male incubating its eggs in its mouth, Sulu sea, Philippines

Linda Pitkin / Ring-tailed cardinalfish (Ostorhinchus aureus), Triton Bay, near Kaimana, West Papua, Indonesia

Pascal Kobeh / Honeycomb moray (Gymnothorax favagineus) in a crack of the reef covered with soft corals (Dendronephthya ) with Ring-tailed cardinalfish (Ostorhinchus aureus), coast of Dhofar and Hallaniyat islands,...

Joel Sartore / Photo Ark / Ring-tailed cardinalfish (Ostorhinchus aureus) close up of head looking around and breathing, Sharjah Aquarium. Captive.

Henley Spiers / Male Ringtailed cardinalfish (Ostorhinchus aureus) rotating eggs that he is brooding in his mouth, Zamboanguita, Negros Oriental, Philippines

David Fleetham / Ring-tailed cardinalfish (Ostorhinchus aureus) carrying eggs in mouth, Philippines.