Edwin Giesbers / Big close up of the eyes of a European Brown bear (Ursus arctos) captive

Juan Manuel Borrero / Illustration of Brown Big-eared Bat (Plecotus auritus). Pencil and watercolor painting.

Todd Mintz / Grizzly Bear (Ursus arctos horribillis) portrait by water. Great Bear Rainforest, British Columbia, Canada, September.

Danny Green / Brown Bear (Ursus arctos) male resting on meadow. Finland, July.

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

Danny Green / Brown Bear (Ursus arctos) portrait. Finland, Europe, June.

Eric Baccega / Comtois Horse (Equus caballus). Camargue reserve, Rhone, France, September.

Sebastian Kennerknecht / Brown Pelican (Pelecanus occidentalis) in breeding plumage, Big Sur, California

Claudio Contreras / Big brown bat (Eptesicus fuscus) on branch, Huichola Sierra, western Mexico, September

Andy Rouse / Grizzly bear (Ursus arctos horribilis) female on alert watching big male, Katmai, Alaska (non-ex)

Michael Durham / Big Brown Bat (Eptesicus fuscus) flying streamside, Rogue River National Forest, Oregon

Michael Durham / Big Brown Bat (Eptesicus fuscus) flying, Rogue River National Forest, Oregon

Michael Durham / Big Brown Bat (Eptesicus fuscus) portrait, Rogue River National Forest, Oregon

Michael Durham / Big Brown Bat (Eptesicus fuscus) portrait, Rogue River National Forest, Oregon

Michael Durham / Big Brown Bat (Eptesicus fuscus) caught in mist net set by researchers at night, Rogue River National Forest, Oregon

Michael Durham / Big Brown Bat (Eptesicus fuscus) on tree at night, Rogue River National Forest, Oregon

Michael Durham / Big Brown Bat (Eptesicus fuscus) flying at night, Rogue River National Forest, Oregon

Flip de Nooyer / Brown Long-eared Bat (Plecotus auritus) hanging upside down, Europe

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) adult female sticking out tongue, late fall, Katmai National Park, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) adult female resting in the late fall, Katmai National Park, Alaska

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) big male by river after gorging on fish, autumn, Katmai National Park, Alaska

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) female with large yearling cub sitting on river's edge, Katmai National Park, Alaska

Pete Oxford / Caliper Beetle (Golofa porteri) large male camouflaged among fallen leaves on forest floor, Andes Mountains, Ecuador

Tui De Roy / Brown Kiwi (Apteryx australis) parent with egg, Kiwi House, Otorohanga Breeding Facility, New Zealand

Phil Savoie / Big brown bats roosting in rafters {Eptesicus fuscus} Connecticut, USA

Barry Mansell / Big brown bat flying {Eptesicus fuscus} Florida, USA

Barry Mansell / Big brown bat in flight {Eptesicus fuscus} Florida, USA

Barry Mansell / Big brown bat flying {Eptesicus fuscus} Florida, USA

Tim Fitzharris / Brown Pelican (Pelecanus occidentalis) group landing, Bean Hollow Beach, Big Sur, California

Sergey Gorshkov / Brown Bear (Ursus arctos), investigating photographer's cage, Kamchatka, Russia

Michael Durham / True Bug, an ectoparasite feeding on part of the wing of a Big Brown Bat (Eptesicus fuscus)

Barry Mansell / Big brown bat flying {Eptesicum fuscus} Florida, USA

Barry Mansell / Big brown bats {Eptesicum fuscus} Florida, USA