David Fleetham / Schooling Raccoon butterflyfish (Chaetodon lunula) framed in a lava formation off the island of Lanai, Hawaii.

David Fleetham / Schooling Raccoon butterflyfish (Chaetodon lunula) framed in a lava formation off the island of Lanai, Hawaii.

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.

David Fleetham / Five images of schooling Raccoon Butterflyfish (Chaetodon lunula) digitally combined for this panorama photograph. Lanai, Hawaii.

David Fleetham / Schooling Raccoon Butterflyfish (Chaetodon lunula) beneath the coastline of West Maui. Five images were combined digitally to create this split scene. Hawaii.

David Fleetham / Schooling Raccoon Butterflyfish (Chaetodon lunula) and a Whitetip Reef Shark (Triaenodon obesus). Lanai, Hawaii. Several images were digitally combined to create this panorama.

David Fleetham / Schooling Raccoon Butterflyfish (Chaetodon lunula) on reef. Lanai, Hawaii. Four images were digitally combined for this panorama photograph.

David Fleetham / A pair of Green Sea Turtles (Chelonia mydas) swimming through a school of Raccoon Butterflyfish (Chaetodon lunula) and Bluestripe Snapper (Lutjanus kasmira). Hawaii. Three images were digitally combin...

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

Aflo / ic-08506 Shoal of Raccoon butterflyfish {Chaetodon lunula} Indo Pacific.

GEORGETTE DOUWMA / Raccoon butterflyfish (Chaetodon lunula). Bali, Indonesia.

Doug Perrine / Scuba diver views shoal of Racoon butterflyfish (Chaetodon lunula) Kaiwi Point, Kona, Hawaii, Pacific (MR 356)

Nature Production / Raccoon Butterflyfish {Chaetodon lunula}

Fred Bavendam / Raccoon Butterflyfish (Chaetodon lunula) underwater portrait, Bali, Indonesia

GEORGETTE DOUWMA / One Raccoon butterflyfish swims in opposite direction to shoal of bannerfish. Digitally manipulated image

Gary Bell/ Oceanwide / Raccoon Butterflyfish (Chaetodon lunula), Great Barrier Reef, Australia

Juergen Freund / Raccoon butterflyfish {Chaetodon lunula} Philippines

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.