Doug Gimesy / Wildlife rescuer and carer drinking cup of coffee with rescued Tawny frogmouth (Podargus strigoides) chick sitting on her shoulder, others in cage in background. Pearl Beach, New South Wales, Australi...

Doug Gimesy / Wildlife rescuer and carer feeding a rodent to Tawny frogmouth (Podargus strigoides) chick, others in aviary. Temporarily captive, to be released back into wild. Pearl Beach, New South Wales, Australi...

David Perpinan / Various Songbirds (Passerine) in cages, confiscated from illegal wildlife trade, Brazil.

David Perpinan / Blue fronted amazon (Amazona aestiva) chicks, confiscated from illegal wildlife trade, Brazil.

Nick Upton / Pine marten (Martes martes) male standing on a feeding table in a soft release cage after arrival from Scotland, during a reintroduction project by the Vincent Wildlife Trust, Cambrian Mountains, Wale...

John Waters / Timelapse of the fruiting body of a Cage stink horn fungus (Clathrus ruber) opening, England, UK.

Franco Banfi / Great white shark (Carcharodon carcharias) swimming in front of scuba diving cages, Guadalupe Island, Mexico, Pacific Ocean. September 2011.

Franco Banfi / Scuba diver photographing Great white shark, (Carcharodon carcharias) from cage. Guadalupe Island, Mexico, Pacific Ocean. September 2011.

Franco Banfi / Scuba diver photographing Great white shark, (Carcharodon carcharias) from cage. Guadalupe Island, Mexico, Pacific Ocean. September 2011.

Paul Williams / Javan slow loris (Nycticebus javanicus) rescued by Jakarta Animal Aid Network (JAAN), in holding cage, Animal rescue centre, Jakarta, Indonesia. Critically Endangered. Post production to remove light...

Nick Upton / Julia Coats of the Animal and Plant Health Agency releasing Eurasian beaver (Castor fiber) back into River Otter. Part of escaped population re-released to the wild following veterinary check ups. Tak...

Jabruson / Eastern gorilla (Gorilla beringei beringei) juvenile confiscated from poachers by national park authorities from poachers, awaiting release to the wild in wooden crate, Djomba, Virunga National Park,...

Jabruson / Eastern gorilla (Gorilla beringei beringei) confiscated juvenile recovered by National Park authorities from poachers, awaiting release to the wild in wooden crate, with hand reaching out, Djomba, Vir...

Jabruson / Chimpanzee (Pan troglodytes schweinfurthii) in cage, confiscated from poachers, housed in Epulu, Okapi Wildlife Reserve, Orientale Province, North-East, Democratic Republic of Congo

Cheryl-Samantha Owen / African penguins (Spheniscus demersus) in rehabilitation at Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) with mother and child looking in. Cape Town South Africa. Novemb...

Franco Banfi / Diver with rebreather inside sea cage used for aquaculture with thousand of Gilt-head bream (Sparus aurata) Ponza Island, Italy, Tyrrhenian Sea, Mediterranean. Model released.

Franco Banfi / Diver with rebreather inside sea cage used for aquaculture with thousand of Gilt-head bream (Sparus aurata) Ponza Island, Italy, Tyrrhenian Sea, Mediterranean. Model released.

Franco Banfi / Thousand of Gilt-head bream (Sparus aurata) inside a sea cage used for aquaculture, Ponza Island, Italy, Tyrrhenian Sea, Mediterranean

Franco Banfi / Fish farm net of sea cage with thousands of Gilt-head bream (Sparus aurata) Ponza Island, Italy, Tyrrhenian Sea, Mediterranean

Terry Whittaker / Pete Turner weighs Pine marten (Martes martes). in trap. Part of Pine marten research by the Waterford Institute of Technology, Ireland. August 2008

Eric Baccega / Scientists of the ONCFS with Common hamsters (Cricetus cricetus) ready for release in a wheat field. Grussenheim, Alsace, France, June 2013 Model released.

Jurgen Freund / Crate of Spectacled flying fox (Pteropus conspicillatus) babies just arrived by plane from Brisbane after months of care, ready to be returned to the Tolga Bat Hospital for release back to the wild, A...

Roland Seitre / Southern bluefin tuna (Thunnus maccoyii) in fish cage of fish farm, Port Lincoln, South Australia, Critically Endangered species. Wild caught fish are reared in large fish cages for maximum growth bef...

Petra Wegner / British Longhair Cats / Highlander, Lowlander, Britanica, four kittens in travel cage, 10 weeks

Lisa Hoffner / A baby orphan Elephant (Loxodonta africana), named Murka, wounded by a poacher's spear is comforted by the touch of another elephant's trunk from outside its pen. David Sheldrick Wildlife Trust Eleph...

Florian Möllers / African Lions (Panthera leo) in a bare cage in Beijing Zoo, China, November.

Jurgen Freund / Mass of juvenile farmed Barramundi cod (Chromileptes altivelis) in cage, Indonesia.

Jurgen Freund / Hook and line fishermen in dugout canoe and self made goggles catching a coral grouper for growing on in cage for the Live reef fish trade, Wakatobi, South Sulawesi, Indonesia

Jurgen Freund / Jewelmer Pearlfarm, Pearl oyster (Pinctada maxima) in hanging cage, Palawan, Philippines, May 2009

Jurgen Freund / Jewelmer Pearlfarm, cleaned Pearl oysters (Pinctada maxima) in hanging cage in the open sea, Palawan, Philippines, May 2009

Simon Colmer / Bee Orchid (Ophrys apifera) growing in protective cage near buildings, Sussex, UK, June 2010

Claudio Contreras / Great white shark (Carcharodon carcharias) passing divers cage, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, Pacific ocean, September

Suzi Eszterhas / Rescued Chimpanzee (Pan troglodytes) within cage, Ngamba Island Chimpanzee Sanctuary, Uganda, Africa. Captive, June 2009.

Sue Flood / Two divers in shark cage, waiting for Great white shark, off shark-diving boat, Guadalupe, Mexico, September 2002

Wild Wonders of Europe / Zankl / Boat collecting divers from tuna cage, Malta, Mediteranean, May 2009

Nick Garbutt / Polar Bear Cub (7-8 months) (Ursus maritimus) investigating photographer through wire fence. Lodge on the shores of Hudson Bay, Canada (Sept).

Nick Garbutt / Polar Bear Cubs (7-8 months) (Ursus maritimus) investigating photographer through wire fence. Lodge on the shores of Hudson Bay, Canada (Sept).

Michel Roggo / Atlantic salmon (Salmo salar) in cage of Salmon farm, Norway, Captive

Pete Cairns / European brown bear (Ursos arctos) in captivity standing up against cage wire. Nord-Trondelag, Norway.

Jabruson / Jaguar resting in zoo cage {Panthera onca} Transvaal, South Africa

Karl Ammann / Depressed Orang utan in Tapei zoo, Taiwan

Karl Ammann / Orang utans (Pongo pygmaeus) in crowded cage, Tapei zoo, Taiwan

John Downer / Mike Richards filming in cage beside vehicle Africa

Jabruson / Mountain gorilla {Gorilla beringei} juvenile in wooden cage recovered from poachers, Virunga NP, Dem Rep Congo

Martha Holmes / Chimpanzee {Pan troglodytes} hand on bar of cage.

Jeff Rotman / Great white shark with divers filming from protective cage. South Australia. Model released.

Norbert Wu / Great White Shark (Carcharodon carcharias) near divers in shark cage, Australia

Michio Hoshino / Polar Bear (Ursus maritimus) pair investigate tourists inside a cage, Churchill, Manitoba, Canada