Ole Jorgen Liodden / Three Spotted Hyena (Crocuta crocuta) cubs. Masai Mara, Kenya, December.

Laurent Geslin / African lion (Panthera leo) two cubs licking blood off their faces after feeding on Wildebeest carcass, Masai Mara reserve, Kenya

Andy Rouse / close up portrait of a Polar Bear (Ursus maritimus), about three year. Svalbard, Norway, Europe, February.

Sergey Gorshkov / Migrating Salmon (Salmonidae) Lake Kuril, Kamchatka, Far East Russia, August

Alex Mustard / Florida manatee (Trichechus manatus latirostrus) swimming under trees in Three Sisters Spring, Crystal River, Florida, USA. January

Alex Mustard / Young Florida manatee (Trichechus manatus latirostrus) portrait, Three Sisters Spring, Crystal River, Florida, USA. February 2010

Eric Baccega / Portrait of Lani hunters with painted faces, head-dressed, nose adornment and penis case / gourd, Baliem valley, West Papua, former Irian-Jaya, Indonesia, August 2002

TJ Rich / African lion {Panthera leo} pride on alert, South Luangwa NP, Zambia

Anup Shah / Cheetah cubs head portait looking over mother's back (Acinonyx jubatus)

TJ Rich / Three curious Red fox cubs {Vulpes vulpes} at den entrance, England, UK, Europe

Peter Blackwell / Three-month-old Cheetah cubs, Masai Mara NP, Kenya,

Suzi Eszterhas / Brown throated Three-toed Sloth (Bradypus variegatus) owner of sloth sanctuary, Judy Avey-Arroyo, feeding cecropia seed pod to 2 month orphan baby, Aviarios Sloth Sanctuary, Costa Rica. Model release...

Suzi Eszterhas / Brown throated Three-toed Sloth (Bradypus variegatus) Judy Avey-Arroyo, Sanctuary Owner, feeding Cecropia leaf to 2 month orpha baby Aviarios Sloth Sanctuary, Costa Rica. Model released

Suzi Eszterhas / Brown throated Three-toed Sloth (Bradypus variegatus) Judy Avey-Arroyo, Sanctuary Owner, administering rehydration fluids to 2 month orphan baby, Aviarios Sloth Sanctuary, Costa Rica. Model released

Suzi Eszterhas / Brown throated Three-toed Sloth (Bradypus variegatus) 2 month orphan sloth with Judy Avey-Arroyo, Sanctuary Owner, Aviarios Sloth Sanctuary, Costa Rica. Model released

Suzi Eszterhas / Brown throated Three-toed Sloth (Bradypus variegatus) newborn baby (less than 1 week old) clinging to mother, Aviarios Sloth Sanctuary, Costa Rica

Tony Heald / Grant's Zebra (Equus quagga boehmi) three drinking at waterhole, Mana Pools National Park, Zimbabwe October 2012

Mark Carwardine / White fronted brown lemur {Eulemur albifrons} three-weeks baby, captive, Maroantsetra, north-eastern Madagascar, IUCN vulnerable species

Christophe Courteau / African lion male yawning {Panthera leo} Botswana

Enrique Lopez-Tapia / Young girls in Ranagaon village, 1.980m, Manaslu Conservation Area, Himalayas, Nepal October 2009

Alex Mustard / Florida manatee (Trichechus manatus latirostris) swimming in evening sunbeams, Three Sisters Spring, Crystal River, Florida, USA.

Nick Garbutt / Bornean orang-Utan (Pongo pygmaeus) female with two infants on a feeding platform, watched by tourists, Camp Leakey, Tanjung Puting NP, Kalimantan, Borneo.

Roland Seitre / Brown-throated Three-toed Sloth (Bradypus variegatus) portrait. Aviarios del Caribe Sloth Sanctuary, Costa Rica, 2008.

Roland Seitre / Brown-throated Three-toed Sloth (Bradypus variegatus) portrait. Captive. Aviarios del Caribe Sloth Sanctuary, Costa Rica.

Ernie Janes / Three Red fox (Vulpes vulpes) heads stuffed and mounted trophies for sale, Europe

Diane McAllister / A Coyote pup (Canis latrans)wwith sleeping siblings. Suburban southwest Reno, Nevada, USA, April

Nick Upton / Three tall Bronze age (c 3,500 years old) granite statue menhir standing stones at Filitosa with carved faces, one with a clear sword symbol. Corsica, France, June 2010.

Dietmar Nill / Three Long eared owls {Asio otus} perched on branch at night, Germany

Tim Laman / Villagers in traditional costume at Payakona Village singsing ceremony. Mount Hagen vicinity in the Western Highlands Province, Papua New Guinea. September 2004

Bernard Castelein / Young buddhist monks listening to a sound recording of monk chanting on an ipod, Enchey Monastery, Gangtok, Sikkim, India October 2007

David Welling / Grey wolf {Canis lupus} young (3 months) portrait captive, USA

Dietmar Nill / Three Long eared owl chicks up in tree (Asio otus) Germany

Hermann Brehm / Three Common zebras {Equus quagga} Kenya

Rod Williams / Three Silvered leaf monkeys {Trachypithecus cristatus} captive, from SE Asia

Rod Williams / Sugar glider {Petaurus breviceps} female and young, captive, from Australia and New Guinea

Neil Lucas / Walrus hauled out {Odonbenus rosmarus} Round Island, Alaska

Nick Garbutt / Young African lions resting {Panthera leo} Serengeti NP, Tanzania, East Africa

Peter Blackwell / Three Cheetah cubs {Acinonyx jubatus} 3 1/2 mths, Masai Mara NR, Kenya

Dietmar Nill / Particolored bats roosting {Vespertilio murinus} Germany

Paul D Stewart / Three toed sloth (Bradypus variegatus) From Conrad Gesner's 'Icones Animalium' published by Christof Froschover, Zurich, 1560. This strange animal is derived from an early Spanish conquistador image r...