Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Larry playing in tree, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphans, Larry investigating Daphne's tongue, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Larry, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Larry playing in forest nursery, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Larry scratching, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Neil Aldridge / Five orphaned White rhinoceros (Ceratotherium simum) calves feed from a trough at dusk at the Rhino Revolution orphanage near Hoedspruit, South Africa. The mothers of these rhinos were killed by poach...

Suzi Eszterhas / Chinese pangolin (Manis pentadactyla), orphaned baby in arms of research assistant. Taipei Zoo, Taipei, Taiwan. 2015. Captive. Model released.

Jurgen Freund / Northern quoll (Dasyurus hallucatus) orphan babies, sleeping on hot water bottle, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Margit Cianelli with Lumholtz tree kangaroo (Dendrolagus lumholtzi) 'Kimberley', a kangaroo she raised from a baby, now living in nearby forest with her own joey. Lumholtz Lodge, Atherton Tabl...

Jurgen Freund / Wildlife carer Margit Cianelli holding Platypus (Ornithorhynchus anatinus) orphan, Atherton Tablelands, Queensland, Australia. Model released.

Jurgen Freund / Hand-reared Boongary (Dendrolagus lumholtzi) feeding in a kitchen, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Hand-reared Boongary (Dendrolagus lumholtzi) descending from a tree and climbing onto its carer's back, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Wildlife carer wrapping a Spectacled flying fox (Pteropus conspicillatus) baby in blankets, Tolga Bat Hospital, Queensland, Australia.

Suzi Eszterhas / Mallard (Anas platyrhynchos) rehabilitator, Isabel Luevano, with one day old orphan duckling, International Bird Rescue, Fairfield, California

Jaymi Heimbuch / African Elephant (Loxodonta africana) orphaned calves with keeper, David Sheldrick Wildlife Trust, Nairobi, Kenya

Jaymi Heimbuch / African Elephant (Loxodonta africana) orphaned calf bottle fed by keeper, David Sheldrick Wildlife Trust, Nairobi, Kenya

Ingo Arndt / Orphan one-week-old Hedgehog baby {Erinaceus europaeus} Germany

Suzi Eszterhas / Common Wombat (Vombatus ursinus) seven month old orphaned joey at feeding time, Bonorong Wildlife Sanctuary, Tasmania, Australia

Suzi Eszterhas / Common Wombat (Vombatus ursinus) foster mother, Linda Tabone, bottle feeding six month old orphaned joey, Bonorong Wildlife Sanctuary, Tasmania, Australia

Suzi Eszterhas / Common Wombat (Vombatus ursinus) five month old orphaned joey with pacifier in mouth, Bonorong Wildlife Sanctuary, Tasmania, Australia

Suzi Eszterhas / Common Wombat (Vombatus ursinus) orphan met by children, Bonorong Wildlife Sanctuary, Tasmania, Australia

Suzi Eszterhas / Common Wombat (Vombatus ursinus) orphan with sanctuary director, Greg Irons, Bonorong Wildlife Sanctuary, Tasmania, Australia

Suzi Eszterhas / Sea Otter (Enhydra lutris) orphaned pup, three weeks old, Alaska SeaLife Center, Seward, Alaska

Inaki Relanzon / African elephant (Loxodonta africana) baby with keeper at David Sheldrick African Elephant Orphanage. Nairobi National Park, Nairobi, Kenya.

Inaki Relanzon / Tourists watching and petting African elephant (Loxodonta africana) calf. David Sheldrick African Elephant Orphanage. Nairobi National Park, Nairobi, Kenya.

Inaki Relanzon / Keeper interacting with young African elephant (Loxodonta africana) after feeding it, David Sheldrick African Elephant Orphanage. Nairobi National Park, Nairobi, Kenya.

Inaki Relanzon / Keeper with young African elephant (Loxodonta africana) calf at David Sheldrick African Elephant Orphanage. Nairobi National Park, Nairobi, Kenya.

Inaki Relanzon / Photographer Inaki Relanzon with African elephant (Loxodonta africana) calf at David Sheldrick African Elephant Orphanage. Nairobi National Park, Nairobi, Kenya.

Inaki Relanzon / Keeper examining African elephant calf's (Loxodonta africana) trunk, David Sheldrick African Elephant Orphanage. Nairobi National Park, Nairobi, Kenya.

Suzi Eszterhas / Sea Otter (Enhydra lutris) three week old orphaned pup being bottle-fed, Alaska SeaLife Center, Seward, Alaska

Suzi Eszterhas / Sea Otter (Enhydra lutris) three week old orphaned pup holding caretaker finger, Alaska SeaLife Center, Seward, Alaska

Suzi Eszterhas / Sea Otter (Enhydra lutris) caretaker, Deanna Troeauga, bottle-feeding three week old orphaned pup, Alaska SeaLife Center, Seward, Alaska

Suzi Eszterhas / Sea Otter (Enhydra lutris) three week old orphaned pup playing with toy, Alaska SeaLife Center, Seward, Alaska

Suzi Eszterhas / Sea Otter (Enhydra lutris) stranding supervisor, Halley Werner, carrying three week old orphaned pup, Alaska SeaLife Center, Seward, Alaska

Suzi Eszterhas / Sea Otter (Enhydra lutris) three week old orphaned pup, Alaska SeaLife Center, Seward, Alaska

Suzi Eszterhas / Sea Otter (Enhydra lutris) three week old orphaned pup playing with toy, Alaska SeaLife Center, Seward, Alaska

Suzi Eszterhas / Sea Otter (Enhydra lutris) three week old orphaned pup being bottle-fed, Alaska SeaLife Center, Seward, Alaska

Suzi Eszterhas / Sea Otter (Enhydra lutris) three week old orphaned pup floating in bucket, Alaska SeaLife Center, Seward, Alaska

Cyril Ruoso / Surrogate mother holding orphan Bonobo (Pan paniscus) and her own baby Lola ya Bonobo Sanctuary, Democratic Republic of the Congo.

Cyril Ruoso / Volunteer feeding young Chimpanzees (Pan troglodytes) Pandrillus Sanctury Rehabilitation Centre, Nigeria.

Cyril Ruoso / Bonobo (Pan paniscus) orphan babies, Lola Ya Bonobo Sanctuary, Democratic Republic of the Congo. Non-ex

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...

Cyril Ruoso / Bonobo (Pan paniscus), bath time for orphan infants with their adoptive mother, Sanctuary Lola Ya Bonobo Chimpanzee, Democratic Republic of the Congo

Cyril Ruoso / Chimpanzee (Pan troglodytes) adult female with orphan baby she has adopted, Gabon

Edwin Giesbers,Edwin Giesbers / Hedgehog (Erinaceus europaeus) one week old orphan at rescue centre, captive

Edwin Giesbers / Hedgehog (Erinaceus europaeus) rear view of young orphan at rescue centre, captive

Mark MacEwen / Orangutan (Pongo pygmaeus) orphan juvenile in nursery, sleeping on toys. Nyaru Menteng Orangutan Reintroduction Project, Central Kalimantan, Borneo, Indonesia.

Claudio Contreras / Central American Spider Monkey (Ateles geoffroyi) orphan baby hanging from washing line. El Mirador- Rio Azul National Park, Department of Peten, Guatemala.

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...

Jurgen Freund / Spectacled flying fox (Pteropus conspicillatus) babies swaddled in cloth ready to sleep, Tolga Bat Hospital, Atherton, North Queensland, Australia. January 2008.

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...

Lisa Hoffner / Orphan elephant (Loxodonta africana) flings red dirt during its daily dust bath. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, April 2007.

Lisa Hoffner / Hungry orphan elephants (Loxodonta africana) greet the milk delivery trailer. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, April 2007. Model released

Lisa Hoffner / A baby orphan Elephant (Loxodonta africana) leaning against the rump of its friend. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, August 2010.

Lisa Hoffner / Orphan baby Elephants (Loxodonta africana) being taken for a walk by their keepers. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Lisa Hoffner / Keeper and a rescued Elephant orphan (Loxodonta africana) embracing. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2008. Model released

Lisa Hoffner / Orphan Rhinoceros (Ceratotherium simum) and Elephant (Loxodonta africana) with blankets on their backs. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Lisa Hoffner / Two orphan baby Elephants (Loxodonta africana) being affectionate. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Lisa Hoffner / Elephant keeper with his young orphan Elephants (Loxodonta africana). David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010. Model released.

Lisa Hoffner / Orphan baby Elephants (Loxodonta africana) playing football with their keeper. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010. Model released.

Lisa Hoffner / Young orphan Elephants (Loxodonta africana) out on a walk. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Lisa Hoffner / Young orphan Elephants (Loxodonta africana) out on a walk. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

Lisa Hoffner / A group of rescued orphan baby Elephants (Loxodonta africana). David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, July 2010.

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.

Mark Carwardine / Chimpanzee (Pan troglodytes) portrait, Captive, rescued as an orphan, Ngamba Island Chimpanzee Sanctuary, Uganda, Africa, Endangered species, October

Suzi Eszterhas / Serval (Leptailurus serval) kitten, two and a half week old orphan, Masai Mara Reserve, Kenya

Anup Shah / Portrait of of juvenile orphaned Chimpanzee {Pan troglodytes}, 2 year old Naika, Sweetwater Sanctuary, Kenya, captive

Martha Holmes / Young orphan chimpanzee (Pan troglodytes) captive, Zambia

Karl Ammann / Baby Western lowland gorilla (Gorilla g gorilla), victim of the illegal bushmeat and pet trades, Central Africa. After shooting an adult gorilla, bushmeat hunters capture the babies for additional pro...

Karl Ammann / Baby Western lowland gorilla (Gorilla g gorilla) head portrait - victim of the illegal bushmeat and pet trade, Pointe Nior, Congo, Central Africa. After shooting an adult gorilla, bushmeat hunters cap...

TOM MANGELSEN / Siberian Tiger cub orphan (Panthera tigris altaica) Omaha Zoo, Nebraska

Anup Shah / Chimpanzee (Pan troglodytes) portrait of juvenile orphan, Sweetwater Sanctuary, 4 yr old, Mahesa with 'pant hoot' expression, a distinctive vocalisation, often used as a contact call (useful in forest...

Gerry Ellis / African Elephant (Loxodonta africana) orphan, Maluti, six months old, charging camera, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Gerry Ellis / African Elephant (Loxodonta africana) orphan called Isholta, five weeks old, playing in mud bath, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Gerry Ellis / African Elephant (Loxodonta africana) keeper Patrick with Lingwesi, a five week old orphan, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Gerry Ellis / African Elephant (Loxodonta africana) orphan called Natumi, charging and playing in mud bath, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Konrad Wothe / Orangutan (Pongo pygmaeus) orphans embracing, Borneo, Malaysia

Gerry Ellis / Raccoon (Procyon lotor) three orphan babies, Aspen Valley, Ontario, Canada

Gerry Ellis / Margay (Leopardus wiedii) wild kitten, captive orphan, Costa Rica

Gerry Ellis / Chimpanzee (Pan troglodytes) orphans Daphne and Larry playing, Ape Action AFrica, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Daphne playing in trees, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Larry, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan clinging to keeper while feeding, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) 3 month old orphan Daphne feeding, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Western Lowland Gorilla (Gorilla gorilla gorilla) orphan played with by rehabilitator, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan in cage, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Western Lowland Gorilla (Gorilla gorilla gorilla) orphan bottle feeding, Mefou Primate Sanctuary, Ape Action Africa, Cameroon

Gerry Ellis / Western Lowland Gorilla (Gorilla gorilla gorilla) orphan feeding, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Daphne in tree, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Larry climbing in forest nursery, Mefou Primate Sanctuary, Ape Action Africa, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Larry climbing in forest nursery, Mefou Primate Sanctuary, Ape Action Africa, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan in tree, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan climbing, Mefou Primate Sanctuary, Ape Action Africa, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan climbing, Mefou Primate Sanctuary, Ape Action Africa, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Daphne and Larry climbing tree, Mefou Primate Sanctuary, Ape Action Africa, Cameroon

Gerry Ellis / Chimpanzee (Pan troglodytes) orphans Jenny and Larry bottle feeding, Ape Action Africa, Mefou Primate Sanctuary, Cameroon