Lisa Hoffner / A young orphan Elephant (Loxodonta africana) being bottle fed milk by its keeper. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010. Model released.

Doug Gimesy / Portrait of a young rescued Grey-headed Flying-foxes (Pteropus poliocephalus) sucking a dummy from her milk feeding bottle. Fly By Night Bat clinic, Olinda, Victoria, Australia.

Doug Gimesy / Portrait of a young rescued Grey-headed flying-fox (Pteropus poliocephalus) sucking a dummy from her milk feeding bottle. Fly By Night Bat clinic, Olinda, Victoria, Australia. January, 2017

Doug Gimesy / Portrait of a young rescued Grey-headed Flying-foxes (Pteropus poliocephalus) sucking a dummy from her milk feeding bottle. Fly By Night Bat clinic, Olinda, Victoria, Australia.

Eric Baccega / Keeper (Mrs. Duan Dong-Quing) giving to the newborn Giant panda (Ailuropoda melanoleuca) its first bottle of colostrum milk (produced in China) 4 hours after its birth, Beauval Zoo, France, 5th Augus...

Eric Baccega / Keeper giving to the newborn Giant panda (Ailuropoda melanoleuca) its first bottle of colostrum milk (produced in China) 4 hours after its birth, Beauval Zoo, France, 5th August 2017 Please contact...

Pat Tuson / Milk delivered in plastic bottles to doorstep, Highbury, London Borough of Islington England UK, April 2015.

Nick Upton / Orphaned young Hedgehog (Erinaceus europaeus) bottle fed with milk at a wild animal rescue centre, Cornwall, UK, October. Model released.

Nick Upton / Orphaned young Hedgehog (Erinaceus europaeus) bottle fed with milk at a wild animal rescue centre, Cornwall, UK, October. Model released.

Suzi Eszterhas / Western Gray Squirrel (Sciurus griseus) three month old orphaned young drinking milk, WildCare, San Rafael, California

Suzi Eszterhas / Western Gray Squirrel (Sciurus griseus) five week old orphaned young drinking mild, WildCare, San Rafael, California

Suzi Eszterhas / Eastern Fox Squirrel (Sciurus niger) three week old orphaned young drinking milk, WildCare, San Rafael, California

Suzi Eszterhas / Striped Skunk (Mephitis mephitis) two week old orphaned young being bottle fed milk, WildCare, San Rafael, California

Steve O. Taylor (GHF) / Village elder resting under acacia tree with bottle of milk, rural Chad, 2002-2003.

Steve O. Taylor (GHF) / Village elder resting under acacia tree with bottle of milk, rural Chad, 2002-2003.

Robin Chittenden / Boy with face made out of milk bottle and leaves, Norwich, UK, November 2013. Model released.

Pat Tuson / Two full glass milk bottles standing on doorstep, one green top and one silver, Highbury, London Borough of Islington, England UK

Lisa Hoffner / Keeper feeding a bottle of milk to one elephant (Loxodonta africana) orphan while playing with another. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, April 2007.

Lisa Hoffner / Baby orphn Elephant (Loxodonta africana) being bottle fed milk by its keeper. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Lisa Hoffner / Orphan baby Elephant (Loxodonta africana) being bottle fed milk by its keeper. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Lisa Hoffner / A baby Elephant (Loxodonta africana) being bottle fed milk by its keeper. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, August 2010.

Lisa Hoffner / A baby Elephant (Loxodonta africana) being bottle fed milk by its keeper. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Lisa Hoffner / A baby orphan Rhinoceros (Ceratotherium simum) bottle fed milk fed by its keeper. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Lisa Hoffner / A baby Elephant (Loxodonta africana) being bottle fed milk by its keeper. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, August 2010.

Lisa Hoffner / A baby orphan Rhinoceros (Ceratotherium simum) bottle fed milk fed by its keeper. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Ernie Janes / Domestic cattle, bottle feeding friesian dairy calf in rearing shed, UK, November 2007

Petra Wegner / British Longhair kitten, aged 3 weeks (Highlander, Lowlander, Britanica) black coated, drinking from a bottle.

Petra Wegner / British Longhair kitten, aged 3 weeks (Highlander, Lowlander, Britanica) ginger coated, drinking from a bottle.

Petra Wegner / British Longhair kitten, aged 3 weeks (Highlander, Lowlander, Britanica) black coated, drinking from a bottle.

Suzi Eszterhas / Plains Zebra (Equus quagga) foal bottle feeding, Safari West, Santa Rosa, CA, USA. Editorial use only

Pete Oxford / Young Long haired / White-bellied Spider monkey (Ateles belzebuth) being fed bottle of milk, Amazoonico Animal Rescue Center (captive) Ecuador, South America

Suzi Eszterhas / Two week orphaned Serval kitten (Leptailurus / Felis serval) being fed milk by foster parent, Suzi Eszterhas. Tanzania, Africa. October 2006

Suzi Eszterhas / Two and a half week orphaned Serval kitten (Leptailurus / Felis serval) feeding from bottle. Tanzania, Africa. October 2006

Suzi Eszterhas / African Elephant (Loxodonta africana) young orphan drinking from bottle, Daphne Sheldrick's Elephant Orphanage, Nairobi, Kenya

Jane Burton / Red fox {Vulpes vulpes} 2-week orphan cub being bottle fed, captive, UK

Jane Burton / Young boy bottle feeding Domestic goat kid {Capra hircus} four-weeks, UK

Eric Baccega / Keeper bottle feeding a 5 days old baby panda at Bifengxia Giant Panda Breeding and Conservation Center,Yaan, Sichuan, China (Ailuropoda melanoleuca)

Eric Baccega / Keeper bottle feeding a 1 and half month old baby panda at Bifengxia Giant Panda Breeding and Conservation Center,Yaan, Sichuan, China (Ailuropoda melanoleuca)

Eric Baccega / Keeper bottle feeding a 5 days old baby panda at Bifengxia Giant Panda Breeding and Conservation Center,Yaan, Sichuan, China (Ailuropoda melanoleuca)

Eric Baccega / Keeper bottle feeding a 3 weeks old baby panda at Bifengxia Giant Panda Breeding and Conservation Center,Yaan, Sichuan, China (Ailuropoda melanoleuca)

Eric Baccega / Keeper bottle feeding a 3 weeks old baby panda at Bifengxia Giant Panda Breeding and Conservation Center,Yaan, Sichuan, China (Ailuropoda melanoleuca)

Suzi Eszterhas / Sea Otter (Enhydra lutris) pup in rehabilitation center drinking milk, California

Eric Baccega / Giant panda (Ailuropoda melanoleuca) baby, 5 months old being bottle fed at Wolong's nursery, Wolong Nature Reserve, China

Eric Baccega / Giant panda (Ailuropoda melanoleuca) baby, 5 months old being bottle fed at Wolong's nursery, Wolong Nature Reserve, China

Theo Allofs / Red Kangaroo (Macropus rufus) orphan joey being fed by biologist near Broken Hill, Australia

Jane Burton / Border Collie, 19-day pup, bottle feeding

Jane Burton / Border Collie pup suckling from bottle, to supplement mothers milk

Jane Burton / Border Collie pup from a large litter, being bottle fed to supplement the mothers milk, 19 days old

Jason Smalley / Bottles of organic milk, Co Durham, UK

Jane Burton / Domestic Cat {Felis catus} 4-week, Orphan kitten, bathed and dry, suckling milk from feeding bottle.

Eric Baccega / Orphan Brown bear cubs (2m-old) bottle fed at rehabilitation centre, Russia {Ursus arctos} 2003.

Eric Baccega / Orphan Brown bear cubs (2m-old) bottle fed at rehabilitation centre, Russia {Ursus arctos} 2003.

Kim Taylor / Blue tit {Parus caeruleus} drinking cream from milk bottle top. UK.

Philip Dalton / Bottle feeding African lion cub {Panthera leo} at rehabilitation centre, South Africa.

Philip Dalton / Bottle feeding African lion cub {Panthera leo} at rehabilitation centre, South Africa

Gerry Ellis / African Elephant (Loxodonta africana) keeper Edwin gives a young orphan a milk bottle, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Gerry Ellis / African Elephant (Loxodonta africana) orphan called Natumi, a 13 month old being fed, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) infant with milk on its mouth after being fed with a bottle at the China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Kim Taylor / Blue tits (Parus caeruleus) competing for cream at the top of a milk bottle. Surrey, England, UK, August. Digital composite

Kim Taylor / Blue tit (Parus caeruleus) drinking cream from milk bottle. Surrey, England, UK, August. Digital composite

Suzi Eszterhas / Eastern Fox Squirrel (Sciurus niger) caretaker, Andrea Rogers, feeding three week old orphaned young milk, WildCare, San Rafael, California

Roland Seitre / Amazon manatee (Trichechus inunguis) orphan baby feeding from milk bottle, captive at Manaus INPA. Occurs in Amazon Basin. Endangered species.

Roland Seitre / Amazon manatee (Trichechus inunguis) orphan baby feeding from milk bottle, captive at Manaus INPA. Occurs in Amazon Basin. Endangered species.

Roland Seitre / Amazon manatee (Trichechus inunguis) orphan baby feeding from milk bottle, captive at Manaus INPA. Occurs in Amazon Basin. Endangered species.

Roland Seitre / Amazon manatee (Trichechus inunguis) orphan baby feeding from milk bottle, captive at Manaus INPA. Occurs in Amazon Basin. Endangered species.

Suzi Eszterhas / Raccoon (Procyon lotor) orphaned baby in foster home, WildCare Wildlife Rehabilitation Center, San Rafael, California

D. Parer & E. Parer-Cook / African Elephant (Loxodonta africana) calf being bottle fed by caretaker, Daphne Sheldrick's Elephant Orphanage, Kenya

D. Parer & E. Parer-Cook / African Elephant (Loxodonta africana) calf being bottle fed by caretaker, Daphne Sheldrick's Elephant Orphanage, Kenya

Tui De Roy / Black Rhinoceros (Diceros bicornis) seven months old baby female orphan cared for at the David Sheldrick Wildlife Trust, Nairobi, Kenya

Petra Wegner / British Longhair Cat, kitten feeding from bottle, 18 days / Highlander, Lowlander, Britanica

Gerry Ellis / African Elephant (Loxodonta africana) keepers feeding milk bottles in bush, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Gerry Ellis / African Elephant (Loxodonta africana) keeper Mishak Nzimbi feeding milk bottle to orphan Natumi, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Doug Gimesy / Bare-nosed wombat (Vombatus ursinus) female, orphan infant aged 4 months, being bottle-fed milk by a veterinary student after being rescued when its mother was hit by a car, Joey and Bat Sanctuary, Be...

Suzi Eszterhas / Caretakers bottle-feeding orphaned infant Bornean orangutans (Pongo pygmaeus), Orangutan Foundation International's Orangutan Care Centre, Borneo, Indonesia, February, 2012. Endangered.

Yves Lanceau / Domestic cat, black and white kitten being fed milk from a bottle.

Yves Lanceau / Domestic dog, Wire-haired Standard Dachshund, puppy being bottle fed

Eric Baccega / Keeper (Mrs. Mao Min) giving the newborn Giant panda (Ailuropoda melanoleuca) its first bottle of colostrum milk, four hours after its birth, Beauval ZooParc, France 2 August 2021. Editorial use only.

Eric Baccega / Keeper (Mrs. Mao Min) giving the newborn Giant panda (Ailuropoda melanoleuca) its first bottle of colostrum milk, four hours after its birth, Beauval ZooParc, France 2 August 2021. Editorial use only.