Wild Wonders of Europe / D'Amicis / Male Ichneumon wasp (Dolichomitus imperator) looking for female on dead wood, Western Tatras, Carpathian Mountains, Slovakia, June 2009

Georgette Douwma / Emperor shrimp (Periclimenes imperator / Zenopontonia rex) camouflaged on sea cucumber, Sipadan, Malaysia.

Fred Bavendam / Emperor Angelfish (Pomacanthus imperator), Thailand

Piotr Naskrecki / Emperor Scorpion (Pandinus imperator), Atewa Range, Ghana

Piotr Naskrecki / Emperor Scorpion (Pandinus imperator) seen under ultraviolet light, Atewa Range, Ghana. Sequence 2 of 2

Piotr Naskrecki / Emperor Scorpion (Pandinus imperator) showing stinger, Atewa Range, Ghana. Sequence 1 of 2

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) juvenile swimming past coral wall with invertebrates and soft corals. Rinca, Indonesia.

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) swimming past coral wall with invertebrates and soft corals. Rinca, Indonesia.

GEORGETTE DOUWMA / Emperor angelfish (Pomacanthus imperator). Red Sea, Egypt.

Georgette Douwma / Nudibranch {Hypselodoris apolegma} (previously H. bullockii) with an Emperor shrimp (Periclemenes imperator) Rinca, Indonesia

Georgette Douwma / Nudibranch {Hypselodoris apolegma} (previously H. bullockii) with an Emperor shrimp (Periclemenes imperator) Rinca, Indonesia

Georgette Douwma / Nudibranch {Hypselodoris apolegma} (previously H. bullockii) with an Emperor shrimp (Periclemenes imperator) Rinca, Indonesia

Georgette Douwma / Nudibranch {Hypselodoris apolegma} (previously H. bullockii) with an Emperor shrimp (Periclemenes imperator) Rinca, Indonesia

GEORGETTE DOUWMA / Emperor shrimp (Periclemenes imperator) and Comb jellies (Coeloplana astericola) on a Luzon starfish (Echinaster luzonicus). Bali, Indonesia.

Georgette Douwma / Nudibranch {Hypselodoris apolegma} (previously H. bullockii) with an Emperor shrimp (Periclemenes imperator) Rinca, Indonesia

Chris Newbert / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Sea Cucumber (Euapta sp), Papua New Guinea

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) swimming past coral wall with soft corals and crinoids. Rinca, Indonesia

Jane Burton / Emperor angelfish {Pomacanthus imperator} captive, from Indo-Pacific

Jane Burton / Emperor angelfish {Pomacanthus imperator} captive, from Indo-Pacific

Jane Burton / Emperor angelfish {Pomacanthus imperator} captive, from Indo-Pacific

Jane Burton / Emperor angelfish {Pomacanthus imperator} captive, from Indo-Pacific

Jane Burton / Emperor angelfish {Pomacanthus imperator} juvenile, captive, from Indo-Pacific

Jane Burton / Emperor angelfish {Pomacanthus imperator} juvenile, captive, from Indo-Pacific

GEORGETTE DOUWMA / Emperor angelfish (Pomacanthus imperator) amongst corals, Red Sea, Egypt

GEORGETTE DOUWMA / Emperor angelfish (Pomacanthus imperator) amongst corals, Red Sea, Egypt

GEORGETTE DOUWMA / Emperor angelfish (Pomacanthus imperator) amongst corals, Red Sea, Egypt

Steve Knell / Emperor dragonfly (Anax imperator) male on bramble leaf in July, Yorkshire, UK

GEORGETTE DOUWMA / Emperor angelfish (Pomacanthus imperator) on coral reef, Red Sea, Egypt

GEORGETTE DOUWMA / Emperor angelfish (Pomacanthus imperator) Red Sea, Egypt

Albert Lleal / Emperor Scorpion (Pandinus imperator) photographed under ultraviolet light, native to Africa

Norbert Wu / Common Squirrelfish (Holocentrus adscensionis) Pennant Bannerfish (Heniochus chrysostomus) and Emperor Angelfish (Pomacanthus imperator) near soft coral ledge, Raja Ampat Islands, Indonesia

Andrew Cooper / Emperor dragonfly larva (Anax imperator) Devon, UK

Ross Hoddinott / Nymph case of Emperor dragonfly {Anax imperator}, Cornwall. UK

GEORGETTE DOUWMA / Emperor angelfish (Pomacanthus imperator). Red Sea, Egypt.

Georgette Douwma / Emperor angelfish {Pomacanthus imperator} Red Sea, Egypt

David Hall / Emperor shrimp (Periclimenes imperator / Zenopontonia rex) on Spanish dancer (Hexabranchus sanguineous) Indonesia

David Hall / Emperor shrimp (Periclimenes imperator / Zenopontonia rex) on Spanish dancer (Hexabranchus sanguineous) Indonesia

David Hall / Emperor shrimp {Pericllimenes imperator on Sea cucumbe, Papua New Guinea

Constantinos Petrinos / Emperor Angelfish (Pomecanthus Imperator) Red Sea, Egypt

Doug Wechsler / Emperor angelfish (Pomacanthus imperator) Pacific

Jose B. Ruiz / Emperor dragonfly {Anax imperator} nymph, larva, Spain, Europe.

Chris Newbert / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Sea Star, 90 feet deep, Papua New Guinea

Rod Williams / Emperor tamarin {Saguinus imperator} captive, from Peru, Bolivia, Brazil

Pete Oxford / Emperor tamarin {Saguinus imperator} Madre de Dios, Peru

Pete Oxford / Emperor tamarin {Saguinus imperator} Madre de Dios, Peru

Pete Oxford / Emperor tamarin {Saguinus imperator} captive from Brazil, Bolivia and Peru

Pete Oxford / Emperor tamarin {Saguinus imperator} Madre de Dios, Peru

Pete Oxford / Emperor tamarin {Saguinus imperator} captive from South America

Ross Hoddinott / Female Emperor dragonfly (Anax imperator) laying eggs. Cornwall, UK.

Luiz Claudio Marigo / Emperor tamarin {Saguinus imperator subgrisescens} Amazonas, Brazil

David Shale / Imperial / Emperor / Giant African scorpion {Pandinus imperator} Captive specimen.

David Shale / Imperial / Emperor / Giant African scorpion {Pandinus imperator} the world's largest scorpion, seen under UV light with ocelli clearly visible. Captive

David Shale / Imperial / Emperor / Giant African scorpion {Pandinus imperator} the world's largest scorpion. Captive

David Shale / Imperial / Emperor / Giant African scorpion {Pandinus imperator} Close-up of pincers / pedipalps. Captive

David Shale / Imperial / Emperor / Giant African scorpion {Pandinus imperator} Close-up of pincer / pedipalp. Captive

David Shale / Imperial / Emperor / Giant African scorpion {Pandinus imperator} Close-up of mouthparts. Captive

David Shale / Imperial / Emperor / Giant African scorpion {Pandinus imperator} Close-up of tail and metasoma. Captive

David Shale / Imperial / Emperor / Giant African scorpion {Pandinus imperator} Close-up of tail and metasoma. Captive

Pete Oxford / Emperor tamarin {Saguinus imperator} captive

Juergen Freund / Emperor angelfish {Pomacanthus imperator} on coral reef, Pacific Ocean.

Juergen Freund / Emperor shrimp on sea cucumber, Indo-Pacific.

Pete Oxford / Emperor tamarin {Saguinus imperator} Madre de Dios, Peru

David Kjaer / Giant african scorpion {Pandinus imperator} captive

Anup Shah / Emperor Tamarin portrait {Saguinus imperator} captive

Pete Oxford / Emperor tamarins grooming {Saguinus imperator} Madre de Dios, Peru

Bernard Castelein / Emperor dragonfly {Anax imperator} Belgium

Pete Oxford / Emperor tamarin {Saguinus imperator} Madre de Dios, Peru

Kim Taylor / Emperor Dragonfly (Anax imperator) male, UK. Captive.

Andrew Cooper / Adult Emperor dragonfly newly emerged, Devon, UK.

SINCLAIR STAMMERS / Close-up of Emperor dragonfly at rest

Ross Hoddinott / Emperor dragonfly {Anax imperator} silhouette seen through leaf. Cornwall, UK

Bernard Castelein / Emperor dragonfly {Anax imperator} Brasschaat, Belgium

Birgitte Wilms / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Sea Cucumber (Synapta maculata) 20 feet deep, Papua New Guinea

Norbert Wu / Emperor Angelfish (Pomacanthus imperator) close-up detail of patterns, Red Sea, Egypt

Norbert Wu / Emperor Angelfish (Pomacanthus imperator), Seychelles, Indian Ocean

Fred Bavendam / Emperor Angelfish (Pomacanthus imperator), Bali, Indonesia

Juergen Freund / Emperor cleaner shrimp {Periclimenes imperator / Zenopontonia rex} on sea cucumber. Indo Pacific

Constantinos Petrinos / Emperor shrimp pair on sea cucumber, Sulawesi, Indonesia

Georgette Douwma / Emperor shrimp {Periclimenes imperator / Zenopontonia rex} on sea cucumber, Papua New Guinea

LYNN M. STONE / Emperor tamarin {Saguinus imperator} lying along a branch. Captive

Doug Perrine / Two Emperor shrimps {Periclimenes imperator / Zenopontonia rex} on gills of Spanish dancer nudibranch, Great Barrier Reef, Australia (Non-ex).

Pete Oxford / Emperor tamarins grooming {Saguinus imperator} Madre de Dios, Peru

Pete Oxford / Emperor tamarins grooming {Saguinus imperator} Madre de Dios rainforest, Peru

Juergen Freund / Emperor shrimp camouflaged on sea cucumberr, Indo-Pacific

Pete Oxford / Emperor tamarins grooming {Saguinus imperator} Madre de Dios, Peru

GEORGETTE DOUWMA / Emperor angelfish {Pomacanthus imperator} Andaman sea, Thailand

GEORGETTE DOUWMA / Emperor angelfish {Pomacanthus imperator} Andaman sea, Thailand

Constantinos Petrinos / Emperor shrimp {Periclimenes imperator / Zenopontonia rex} and tiny harlequin crab {Lissocarcinus orbicularis} on sea cucumber {Bohadschia argus} Sulawesi Indonesia

Constantinos Petrinos / Chromodorid nudibranch {Ceratosoma tenue} laying egg mass + commensal Imperial shrimp {Periclimenes imperator / Zenopontonia rex} Lembeh straits, Sulawesi, Indonesia

Constantinos Petrinos / Dorid nudibranch {Risbecia tryoni} with pair of commensal Imperial shrimps {Periclimenes imperator / Zenopontonia rex} Lembeh straits, Sulawesi, Indonesia

Jeff Rotman / Close-up of skin around tail of Emperor angelfish (Polmacanthus imperator) Red Sea

LYNN M. STONE / Emperor tamarin {Saguinus imperator} perched on thin branch. C

Thomas Marent / Emperor Tamarin (Saguinus imperator), native to Brazil

Thomas Marent / Emperor Tamarin (Saguinus imperator), native to Brazil

Chris Shields / Illustration of Emperor Dragonfly (Anax imperator), Aeshnidae. Endemic to Eurasia and Africa.

Roberto Rinaldi / Emperor shrimp (Periclimenes imperator / Zenopontonia rex) hiding in gills of Spanish dancer nudibrach (Hexabranchus sanguineus), La Runion, Indian Ocean.