Nick Upton / Blind adult male Grey seal (Halichoerus grypus) 'Marlin' waving a flipper at the edge of a convalescence pool where he is a long-term resident, Cornish Seal Sanctuary, Gweek, Cornwall, UK, January. Mo...

Sebastian Kennerknecht / Sunda Clouded Leopard (Neofelis diardi) male with cataract in his right eye in lowland rainforest, Tawau Hills Park, Sabah, Borneo, Malaysia

Gerrit Vyn / Flock of oiled Brown Pelicans (Pelecanus occidentalis) on a beach behind an oil covered containment boom. This nesting colony is the largest in Louisiana and was heavily contaminated by the BP Deepwat...

Gerrit Vyn / Laughing Gull (Leucophaeus atricilla) juvenile, heavily oiled as a result of the BP Deepwater Horizon oil spill in the Gulf of Mexico. Baldwin County, Alabama. USA, June 2010.

Georgette Douwma / A rescued battery hen. They often lack feathers when they come out of the battery barns. UK.

Georgette Douwma / Rescued battery hens with rooster. The chickens often lack feathers when they come out of the battery barns. UK.

Peter Scoones / Bleached {Acropora sp} coral caused by loss of algae due to temperature change. Maldives.

Anup Shah / Leopard cub with ticks in ears {Panthera pardus} Masai Mara, Kenya

Doug Gimesy / During an extreme heat-stress event at Melbourne's Yarra Bend Grey-headed Flying-fox (Pteropus poliocephalus) colony, where temperatures exceeded 43??in a desperate search for somewhere cooler and les...

Doug Gimesy / Damaged wing of Grey-headed Flying-fox (Pteropus poliocephalus) - the result of being caught in barbed-wire that surrounded a school. This bat had to be euthanised. Albert Park, Victoria, Australia. M...

Alex Mustard / Wire coral goby (Bryaninops yongei) with what looks like a fungal infection covering its body on a wire coral (Cirripathes sp.). Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Nick Hawkins / A young moose (Alces alces) with a condition known as 'ghost moose' which is caused by heavy tick investations. New Brunswick, Canada. August

Nick Hawkins / A young moose (Alces alces) with a condition known as 'ghost moose' which is caused by heavy tick infestation, New Brunswick, Canada. August

Suzi Eszterhas / Isabel Luevano, Rehabilitation Technician, and volunteer, examining Brown pelican (Pelecanus occidentalis) that is suffering from malnutrition International Bird Rescue, Fairfield, California, USA, M...

Suzi Eszterhas / Brandt's Cormorant (Phalacrocorax penicillatus) pellet of worms coughed up by cormorant International Bird Rescue, Fairfield, California

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed trees, Jasper National Park, Alberta, Canada

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed trees, Jasper National Park, Alberta, Canada

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), El Capitan, Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead tree, with pitch tube, killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

David Perpinan / Cachectic or emaciated captive Bearded dragon (Pogona vitticeps) confiscated by police due to poor care'United Kingdom. Small repro only

David Perpinan / Deformed Hermann's tortoise (Testudo hermanni). This is a common condition in Mediterranean tortoises kept in cold weathers or under inadequate husbandry. Small repro only

David Perpinan / Gastric hyperplasia in a captive corn snake (Pantherophis guttatus). This is a common and often fatal infection in captive snakes. Small repro only

David Perpinan / Captive veiled chameleon (Chamaeleo calyptratus). This animal is extremely thin (cachectic) and has metabolic bone disease due to inadequate husbandry. Problems related to husbandry deficiencies are v...

David Perpinan / Loggerhead sea turtle (Caretta caretta) under rehabilitation with fibropapillomatosis affecting the neck. This is a common disease in some wild populations of sea turtles. Georgia, United States sma...

David Perpinan / Snake fungal diseases in a wild Eastern indigo snake (Drymarchon couperi). This is an emerging disease in wild snakes of North America. Small repro only

David Perpinan / Snake fungal disease in a wild Eatern Indigo snake (Drymarchon couperi). This is an emerging disease in wild snakes of North America. Small repro only

David Perpinan / Loggerhead sea turtle (Caretta caretta) juvenile with severe malformation due to inadequate feeding (excessive protein). Small repro only.

David Perpinan / Radiography of a captive Bearded dragon (Pogona vitticeps) with sand impaction, a common condition in captive reptiles. small repro only

David Perpinan / Captive bearded dragon (Pogona vitticeps) suffering from mite infestation. Small repro only

David Perpinan / Stomatitis in a captive Chinese water dragon (Physignathus cocincinus). This is a common condition in captive water dragons, as they are nervous and hit themselves against glass.

David Perpinan / Phallus/penile prolapse in a captive Yellow bellied slider (Trachemys scripta). Small repro only

David Perpinan / Microscopic image of oxyurid nematode parasites in the faecal sample of a captive Hermann's tortoise (Testudo hermanni) Small repro only.

David Perpinan / Beak overgrowth in Eastern box turtle (Terrapene carolina). This is a common condition in captive chelonians. Captive animal. Small repro only

David Perpinan / Common marmoset (Callithrix jacchus) juvenile with metabolic bone disease. This is a common disease in captivity caused by inadequate husbandry. Small repro only

David Perpinan / Radiography of a wild herring gull (Larus argentatus) showing osteomyelitis affecting the left tarsal joint. Small repro only

David Tipling / Great tit (Parus major) with Avian Pox, Hungary, January

Terry Whittaker / Red fox (Vulpes vulpes) with mange feeding in an urban garden, Greater Manchester, UK, August. Filmed using a camera trap.

Terry Whittaker / Red fox (Vulpes vulpes) with mange sniffing and marking in an urban garden, Greater Manchester, UK, August. Filmed using a camera trap.

Paul Bertner / Braconid Wasp (Braconidae) cocoons attached to parasitized caterpillar, Udzungwa Mountains National Park, Tanzania

Neil Aldridge / Red fox (Vulpes vulpes) juvenile showing signs of mange in its coat and eyes, stepping out from its den behind a garden shed, Bristol, England, UK. June 2015. Winner of the Portfolio Category of Natur...

David Fleetham / Green turtle (Chelonia mydas) with fibropapilloma tumors covering its head and eyes. Soon the tumors will grow to cover both eyes and limit the turtles ability to locate a food source. Hawaii.

David Fleetham / Green turtle (Chelonia mydas) with fibropapilloma tumors covering its head and eyes. Soon the tumors will grow to cover both eyes and limit the turtles ability to locate a food source. Hawaii.

Emanuele Biggi / Abra Acanacu marsupial frog (Gastrotheca excubitor) dying due to heart attack caused by Chytrid fungus (Batrachochytrium dendrobatidis) Peru.

Eric Baccega / Female Orangutan (Pongo pygmaeus) under anaesthetic and undergoing an MRI scanner in the surgery station of the zoo, Zooparc Beauval, France, October 2017.

Eric Baccega / Veterinarian taking a blood sample from female Orangutan (Pongo pygmaeus) under anaesthetic, before a check with an MRI scanner, Beauval Zoo, France, October 2017.

Eric Baccega / Veterinarian practising endoscopy on a female Orangutan (Pongo pygmaeus) under anaesthetic, having a pulmonary infection, Beauval Zoo, France, October 2017.

Eric Baccega / Female Orangutan (Pongo pygmaeus) under anaesthetic and undergoing a MRI scan, Beauval Zoo. France, October 2017.

Eric Baccega / Veterinarian transporting a female Orangutan (Pongo pygmaeus) under anaesthetic for a check with an MRI scanner, Zooparc Beauval, France, October 2017.

Eric Baccega / Female Orangutan (Pongo pygmaeus) under anaesthetic and undergoing an MRI scanner in the surgery station of the zoo, Zooparc Beauval, France, October 2017.

Eric Baccega / Chief veterinarian, Baptiste Mulot, performing MRI imaging on a female Orangutan (Pongo pygmaeus) under anaesthetic in the zoo surgery station, Zooparc Beauval, France, October 2017.

Eric Baccega / Veterinarian checking a female Orangutan (Pongo pygmaeus) under anaesthetic. This Orangutan has a pulmonary infection. Beauval Zoo France, October 2017.

Eric Baccega / Veterinarian making an intravenous infusion for female Orangutan (Pongo pygmaeus) under anaesthetic, before a scan with an MRI scanner, Beauval Zoo, France, October 2017.

Eric Baccega / Veterinarian treating a pulmonary infection in a female Orangutan (Pongo pygmaeus) under anaesthetic, Beauval Zoo, France, October 2017.

Eric Baccega / Female Orangutan (Pongo pygmaeus) under anaesthetic and undergoing an MRI scan, Beauval Zoo,France, October 2017.

Eric Baccega / Veterinarian treating a pulmonary infection on a female Orangutan (Pongo pygmaeus) under anaesthetic, Beauval Zoo, France, October 2017.

Eric Baccega / Veterinarian administratiing a sedative injection to a female Orangutan (Pongo pygmaeus) for a check with an MRI scanner, Zooparc Beauval, France, October 2017.

Eric Baccega / Veterinarian checking a female Orangutan (Pongo pygmaeus) under anaesthetic. This Orangutan has a pulmonary infection. Beauval Zoo France, October 2017.

Eric Baccega / Female Orangutan (Pongo pygmaeus) under anaesthetic and undergoing an MRI scanner in the surgery station of the zoo, Zooparc Beauval, France, October 2017.

Paul Bertner / Leaf with virus, Cuc Phuong National Park, Vietnam

Paul Bertner / Leaf with virus, Antananarivo, Madagascar

Frederique Olivier / Southern giant petrel (Macronectes giganteus) resting along the edge of the shore, lacking alertness, potentially due to secondary poisoning from pest eradication, Macquarie Island, Sub-Antarctic Aust...

Tui De Roy / Small ground finch (Geospiza fuliginosa) with advanced case of introduced avian pox disease, usually fatal. Galapagos

Suzi Eszterhas / Vet with koala (Phascolarctos cinereus) male sick with chlamydia, Currumbin Wildlife Hospital, Queensland, Australia, captive.

Suzi Eszterhas / Vet with koala (Phascolarctos cinereus) male sick with chlamydia, Currumbin, Wildlife Hospital, Queensland, Australia, captive.

Suzi Eszterhas / Koala (Phascolarctos cinereus), male sick with chlamydia on scale while under anaesthetic. Currumbin Wildlife Hospital, Queensland, Australia, captive.

Suzi Eszterhas / Koala (Phascolarctos cinereus) Joey aged eight months, sick with urinary tract infection, on scales, Dreamland, Queensland, Australia, captive.

Tony Wu / Eden's whale (Balaenoptera edeni edeni) displaying circular patterns on skin. The cause of these patterns has not been confirmed however it may be caused by a skin infection or virus. Gulf of Thailand...

Suzi Eszterhas / Common Wombat (Vombatus ursinus) with mange grazing on farm, Tasmania, Australia

Georgette Douwma / Rose-ringed / Ring-necked parakeet (Psittacula krameri) which has lost lots of feathers on bird feeder, molting. London, UK.

Georgette Douwma / Rose-ringed / Ring-necked parakeet (Psittacula krameri) on bird feeder, with lots of feathers missing, London, UK.

Charlie Summers / Humpback salmon (Oncorhynchus gorbuscha) male that has contracted the onset of gray mold / grey mould, making its way upstream in Walker Cove Creek, Misty Fjord National Monument, Alaska, USA, August...

Olga Kamenskaya / Diver exploring sick sponge, stricken by a Cyanobacteria and filamentous algae, Lake Baikal, Siberia, Russia. July 2015.

Olga Kamenskaya / Diver exploring sick sponge, stricken by a Cyanobacteria , Lake Baikal, Siberia, Russia. July 2015. Model released.

Olga Kamenskaya / Sick freshwater sponge, stricken by a Cyanobacteria , Lake Baikal, Siberia, Russia. July 2015.

Olga Kamenskaya / Sick sponge, stricken by a Cyanobacteria, Lake Baikal, Siberia, Russia. December.

Olga Kamenskaya / Sick sponge, stricken by a Cyanobacteria, Lake Baikal, Siberia, Russia. December.

Olga Kamenskaya / Sick sponge, stricken by a Cyanobacteria, Lake Baikal, Siberia, Russia. December.

Olga Kamenskaya / Sick sponge, stricken by a Cyanobacteria, Lake Baikal, Siberia, Russia. December.

Olga Kamenskaya / Sick sponge, stricken by a Cyanobacteria, Lake Baikal, Siberia, Russia. December.

Olga Kamenskaya / Sick sponge, stricken by a Cyanobacteria, Lake Baikal, Siberia, Russia. December.

Mark Carwardine / Orca (Orcinus orca), type one, with flaccid or collapsed dorsal fin, caused by stress, traumatic injury or ill-health, Snaefellsnes Peninsula, western Iceland

Andy Rouse / Red Fox (Vulpes vulpes) with mange. Cardiff, Wales. May.

Michael Hutchinson / Domestic Sheep kneeling, this sheep has painful front feet most likely due to overgrown hooves, Gloucestershire, UK, March

Nick Upton / British Divers Marine Life Rescue (BDMLR) vet Darryl Thorpe takes a blood sample from an injured grey seal pup (Halichoerus grypus) 'Jenga', at BDMLR seal pup treatment facility before its transfer to...

Nick Upton / British Divers Marine Life Rescue animal medics Michelle Clement and Rachel Shorland carrying injured Grey seal pup (Halichoerus grypus) 'Jenga', in a bag after rescuing it from a beach, Widemouth Ba...

Nick Upton / Weak, injured, Grey seal (Halichoerus grypus) pup 'Jenga', carried to British Divers Marine Life Rescue treatment facility in a crate, before its transfer to the Cornish Seal Sanctuary, Cornwall, UK,...

Nick Upton / British Divers Marine Life Rescue vet Darryl Thorpe inspecting the body of Grey seal pup (Halichoerus grypus) 'Jenga' for injuries at BDMLR seal pup treatment facility, before its transfer to the Corn...

Nick Upton / British Divers Marine Life Rescue animal medics Rachel Shorland and Michelle Clement weighing injured Grey seal pup (Halichoerus grypus) 'Jenga' in bag, Widemouth Bay, Cornwall, UK, October. Model rel...

Nick Upton / Sick, injured Grey seal pup (Halichoerus grypus) 'Jenga', with bite marks on its flippers and body and a runny nose, washed up on the tide line, Widemouth Bay, North Cornwall, UK, October.

Nick Upton / Michelle Clement, a British Divers Marine Life Rescue animal medic inspecting the teeth and gums of a sick, injured Grey seal pup (Halichoerus grypus) 'Jenga', found washed up on the tide line, Widemo...

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed trees fueling forest fire, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) pair killed by resin, Colorado