Laurent Geslin / Brown Hyaena (Hyaena brunna) running. Skeleton Coast, Namibia

Anup Shah / Spotted hyaena predating newborn Thomson's gazelle, Serengeti NP, Tanzania {Crocuta crocuta}

Piotr Naskrecki / Mantis Fly (Climaciella brunnea), Estabrook Woods, Concord, Massachusetts

Piotr Naskrecki / Mantis Fly (Climaciella brunnea), Estabrook Woods, Concord, Massachusetts

Christophe Courteau / Pride of African lions (Panthera leo) with a kill at night time, watched by Brown hyaenas (Hyaena brunnea). The Dominant Lioness is defending the clan and faces the Hyaenas. Botswana

Christophe Courteau / African lions (Panthera leo) with a kill at night time, Brown hyaenas (Hyaena brunnea) looking on, lit by spotlight. Botswana

Richard Du Toit / Brown Hyena (Hyaena brunnea), Kgalagadi Transfrontier Park, Botswana

Alex Mustard / Feather duster worms (Bispira brunnea) colony extended and filter feeding in the clear blue waters of The Bahamas, Caribbean Sea.

Richard Du Toit / Brown Hyena (Hyaena brunnea), Kalahari, Northern Cape, South Africa

Ann & Steve Toon / Brown hyena (Hyaena brunnea) drinking at waterhole, Kgalagadi Transfrontier National Park, Northern Cape, South Africa

Ann & Steve Toon / Brown hyena (Hyaena brunnea) portrait, standing at small waterhole, Kgalagadi Transfrontier National Park, Northern Cape, South Africa

Ann & Steve Toon / Brown hyena (Hyaena brunnea) drinking at waterhole, Kgalagadi Transfrontier National Park, Northern Cape, South Africa

Ann & Steve Toon / Brown hyena (Hyaena brunnea) walking, Kgalagadi Transfrontier National Park, Northern Cape, South Africa

Ann & Steve Toon / Brown hyena (Hyaena brunnea) Kgalagadi Transfrontier National Park, Northern Cape, South Africa

Claudio Contreras / Social feather duster worms (Bispira brunnea) Cancun National Park, Caribbean Sea, Mexico, July

Claudio Contreras / Social feather duster worms (Bispira brunnea) Cancun National Park, Caribbean Sea, Mexico, August

Pete Oxford / Brown hyaena (Hyaena brunnea) portrait, Namibia

Richard Du Toit / Brown Hyena (Hyaena brunnea), Kgalagadi Transfrontier Park, South Africa

Michele Westmorland / Brown hyaena (Hyaena brunnea) rare viewing on the Skeleton Coast, Namibia

Vincent Grafhorst / Brown Hyena (Hyaena brunnea) and Black-backed Jackal (Canis mesomelas) scavenging from carcass, Khama Rhino Sanctuary, Serowe, Botswana

Richard Du Toit / Brown Hyena (Hyaena brunnea) in tall grass, Kgalagadi Transfrontier Park, South Africa

Doug Perrine / Colonial feather duster worms {Bispira brunnea} Dominica, Caribbean

Juergen Freund / Feather duster worm {Bispira brunnea} and Fancoral, Caribbean.

Juergen Freund / Social Feather dusters / Fanworms {Bispira brunnea} Cuba, Caribbean

Juergen Freund / Social feather duster against sunlight (Bispira brunnea) Caribbean

Juergen Freund / Social feather dusters {Bispira brunnea} Cuba, Caribbean sea

Doug Perrine / Social feather duster worms {Bispira brunnea} and red encrusting sponge {Monanchora barbadensis} St Vincent, Caribbean

Norbert Wu / Feather Duster Worm (Bispira brunnea) worms trap plankton with feathery gills, Caribbean

Juergen Freund / Social Feather dusters feeding at night {Bispira brunnea} Cuba, Caribbean

Juergen Freund / Social feather duster. (Bispira brunnea) Caribbean

Juergen Freund / Social Feather dusters. Caribbean Sea, off Cuba

Richard Du Toit / Brown hyaena. South Africa, Kalahari Gemsbok National Park

Angelo Giampiccolo / Colony of Feather dusters (Bispira brunnea) with their feathers wide open to catch plankton. Belize Cayes, Caribbean.

Roberto Rinaldi / Feather duster worm / cluster duster (Bispira brunnea), Honduras.

Angelo Giampiccolo / Colony of Feather dusters (Bispira brunnea) with their feathers wide open to catch plankton, Belize Cayes, Caribbean.

Roberto Rinaldi / Colony of feather duster / cluster duster worms (Bispira brunnea), Honduras.

Tony Heald / Brown hyaena drinking {Hyaena brunnea} Kgalagadi Transfrontier Park South Africa

Tony Heald / Brown hyaena drinking {Hyaena brunnea} Kalahari Gemsbok NP S Africa

Tony Heald / Brown hyaena {Hyaena brunnea} Kalahari Gemsbok NP, S Africa

Pete Oxford / Brown hyaena portriat (Hyaena brunnea) Namibia

Tony Heald / Brown hyaena {Hyaena brunnea} Kgalagadi transfrontier Park South Africa