Alex Mustard / Threadfin butterflyfish (Chaetodon auriga) feeding on ctenophore jellyfish. Sharm El Shiekh, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Jeff Rotman / Threadfin Butterflyfish (Chaetodon auriga) diver observing fish caught in Bedouin gill net, Egypt, Red Sea. Model released. October 2002. Model released.

Jeff Rotman / Threadfin butterflyfish (Chaetodon auriga) Sinai Peninsula, Red Sea, Egypt

Aflo / ic-08302 Two Threadfin butterflyfish {Chaetodon auriga} Japan

Joel Sartore / Photo Ark / Auriga butterflyfish (Chaetodon auriga) portrait, Gulf Specimen Marine Laboratories. Captive, occurs in Indo-Pacific.

Joel Sartore / Photo Ark / Auriga butterflyfish (Chaetodon auriga) portrait, Gulf Specimen Marine Laboratories. Captive, occurs in Indo-Pacific.

Doug Perrine / Threadfin butterflyfish (Chaetodon auriga) portrait, showing darkened colour pattern during the day, normally displayed at night, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Threadfin butterflyfish (Chaetodon auriga) portrait, Kona, Hawaii, Pacific Ocean.

Doug Perrine / Schooling bannerfish / False moorish idol (Heniochus diphreutes) juvenile, cleaning a Threadfin butterflyfish (Chaetodon auriga), North Kona, Hawaii, Pacific Ocean.

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

Doug Perrine / Threadfin butterflyfish (Chaetodon auriga) school swimming over reef, South 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),...