David Fleetham / Diver looking at underwater fish identification chart in front of schooling Raccoon butterflyfish (Chaetodon lunula) and a lava formation. Lanai, Hawaii. July 2012. Model released.

Richard Robinson / Chaetodon lunula Raccoon Butterflyfish (Chaetodon lunula) at South Minerva Reef / Teleki Tonga, a disputed territory in the South Pacific between Tonga and Fiji.

Doug Perrine / Pair of Halfmoon butterflyfish (Chaetodon lunula) on wreck of the Predator, a sunken landing craft, Kailua Bay, Kona, Hawaii.

Doug Perrine / Threadfin butterflyfish (Chaetodon auriga) with Raccoon butterflyfish (Chaetodon lunula) in background, Kona, Hawaii, Pacific Ocean.

Doug Perrine / Hawaiian cleaner wrasse (Labroides phthirophagus) cleaning a Raccoon butterflyfish (Chaetodon lunula), North Kona Coast, Hawaii Island, Pacific Ocean.

Doug Perrine / Two Raccoon butterflyfish (Chaetodon lunula) waiting to be cleaned of parasites by two approaching Hawaiian cleaner wrasses (Labroides phthirophagus), North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Raccoon butterflyfish (Chaetodon lunula) feeding on Sergeant major damselfish (Abudefduf sp.) eggs deposited on rock, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Raccoon butterflyfish (Chaetodon lunula) school, feeding on Sergeant major damselfish (Abudefduf sp.) eggs deposited on rock, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Raccoon butterflyfish (Chaetodon lunula) portrait, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Raccoon butterflyfish (Chaetodon lunula) school, swimming over reef, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Tiger shark (Galeocerdo cuvier) with remora or suckerfish clinging to flank, Bluefin trevally (Caranx melampygus), Racoon butterflyfish (Chaetodon lunula), Threadfin butterflyfish (Chaetodon auriga),...

Doug Perrine / Tiger shark (Galeocerdo cuvier) with fish hook in corner of its mouth, swimming across coral reef populated with Racoon butterflyfish (Chaetodon lunula), Threadfin butterflyfish (Chaetodon auriga), Su...

David Fleetham / Raccoon butterflyfish (Chaetodon lunula), endemic Saddle wrasse (Thalassoma duperrey) and Sea urchin (Diadema sp.) on reef, Lanai, Hawaii, Pacific Ocean.

David Fleetham / Saddle wrasse (Thalassoma duperrey) with schooling Raccoon butterflyfish (Chaetodon lunula) off the island of Lanai, Hawaii.

Doug Perrine / Pacific trumpetfish (Aulostomus chinensis) camouflaging itself while hunting by adopting yellow colour phase and swimming among Raccoon butterflyfish (Chaetodon lunula) Kaiwi Point, Kona, Hawaii.