Gary Bell/ Oceanwide / Hairtail Blenny (Xiphasia setifer), Great Barrier Reef, Australia

Constantinos Petrinos / Hair-tail blenny (Xiphasia setifer) adult. Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Hair-tail blenny (Xiphasia setifer) adult coming out of its burrow, Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Hair-tail blenny (Xiphasia setifer) adult coming out of its burrow, Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Hair-tail blenny (Xiphasia setifer) adult swimmin away from its burrow, Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Hair-tail blenny (Xiphasia setifer) adult swimmin away from its burrow, Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Hair-tail blenny (Xiphasia setifer) adult swimmin away from its burrow, Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Hair-tail blenny (Xiphasia setifer) adult swimmin away from its burrow, Lembeh Strait, North Sulawesi, Indonesia.

Chien Lee / Greater Hedgehog Tenrec (Setifer setosus) climbing tree, Madagascar

Chien Lee / Greater Hedgehog Tenrec (Setifer setosus) on forest floor, Madagascar

Chien Lee / Greater Hedgehog Tenrec (Setifer setosus), Palmarium Reserve, Madagascar

Chien Lee / Greater Hedgehog Tenrec (Setifer setosus) in defensive posture rolled into a ball, Palmarium Reserve, Madagascar

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

Konrad Wothe / Young tenrecs (Setifer setosus) Madagascar, Africa, captive

Thomas Marent / Greater Hedgehog Tenrec (Setifer setosus), Ankarana Special Reserve, northern Madagascar

Thomas Marent / Greater Hedgehog Tenrec (Setifer setosus), Ankarana Special Reserve, northern Madagascar

Konrad Wothe / Greater Hedgehog Tenrec (Setifer setosus) portrait, Madagascar

Patricio Robles Gil / Greater Hedgehog Tenrec (Setifer setosus) clinging to tree trunk, Madagascar

Pete Oxford / Greater Hedgehog Tenrec (Setifer setosus) portrait, Daraina, northeast Madagascar

Pete Oxford / Greater Hedgehog Tenrec (Setifer setosus) walking on leaf litter of forest floor, Daraina, northeast Madagascar

GEORGETTE DOUWMA / Hairtail blenny {Xiphasia setifer}, Sulawesi, Indonesia.

Pete Oxford / Large Madagascar hedgehog, Ankarana Reserve, Madagascar

Pete Oxford / Large Madagascar hedgehog, Ankarana, Madagascar

Nick Garbutt / Large Madagascar hedgehog (Setifer setosus). Nosy Mangabe reserve, Madagascar

Pete Oxford / Large Madagascar hedgehog. Ankarana SR, Madagascar

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.

Nick Garbutt / Greater hedgehog tenrec (Setifer setosus) on forest floor at night, Kirindy Forest, western Madagascar.

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

David Fleetham / Threadfin butterfly-fish (Chaetodon auriga) shoal, Rarotonga Lagoon, The Cook Islands.

Magnus Lundgren / Young snake blenny (Xiphasia setifer) with a reddish parasite on one side, free swimming in the open ocean at night, Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean.

Magnus Lundgren / Young snake blenny (Xiphasia setifer) with open mouth. swimming in the open ocean at night, Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean.

Magnus Lundgren / Snake blenny (Xiphasia setifer) juvenile free swimming in the open ocean at night, Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean.

Magnus Lundgren / Snake blenny (Xiphasia setifer) juvenile free swimming in the open ocean at night, Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean. It has a parasite that attached close to its head