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.

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

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

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.