Sergey Gorshkov / African Lion (Panthera leo) cub nuzzling against male, Botswana

Sergey Gorshkov / African Lion (Panthera leo) cubs playing around male, Botswana

Xi Zhinong / Yunnan Snub-nosed Monkey (Rhinopithecus bieti) family, Baima Snow Mountain, Yunnan, China

Tui De Roy / Medium Ground-Finch (Geospiza fortis) fledgling begging for food from male, Galapagos Islands, Ecuador

Tui De Roy / Medium Ground-Finch (Geospiza fortis) fledgling begging for food from male, Galapagos Islands, Ecuador

Murray Cooper / Orange-fronted Barbet (Capito squamatus) male bringing food to nest cavity, Ecuador

Murray Cooper / Oilbird (Steatornis caripensis) pair in nest with chick, Ecuador

Jeff Rotman / Man filming his daughter free diving amongst Giant kelp forest, Anacapa Island, California, Pacific Ocean Model released Model released.

David Woodfall / Father, baby and son washing in village pond during the monsoon rain, Ganges delta, Bangladesh, November 2008

Piper Mackay / Father and daughter Wounaan indians canoeing down the Chagres river, Panama, November 2008, Model released

Piper Mackay / A young Embra Indian father holds his son while playing the flute, Soberania NP, rainforest, Panama, November 2008

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) with newly hatched chick, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) pair with newly hatched chick, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) pair with newly hatched chick, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male guarding chick, Galapagos Islands, Ecuador

Jerry Monkman / Father and his two children birdwatching in a hay field on a farm in Ipswich, Massachusetts, USA, May 2009. Model released.

Patricio Robles Gil / Gelada baboon (Theropitecus gelada) male interacting with young up tree, Simien Mountains NP, Ethiopia

Steve Gettle / Sandhill Crane (Grus canadensis) family at nest, Kensington Metropark, Michigan

Charlie Hamilton James / Kingfisher (Alcedo atthias) adult female flying into nest with fish. Halcyon River, England.

Charlie Hamilton James / Kingfisher (Alcedo atthias) adult male flying out of nest. Halcyon River, England.

Charlie Hamilton James / Kingfisher (Alcedo atthias) adult male flying into nest with fish, England.

Charlie Hamilton James / Kingfisher (Alcedo atthias) adult male flying into nest with fish. Halcyon River, England.

Chien Lee / Rough Guardian Frog (Limnonectes finchi) male transporting tadpoles to a suitable pool of water where he will release them, Danum Valley Conservation Area, Borneo, Malaysia

Chien Lee / Rough Guardian Frog (Limnonectes finchi) male transporting tadpoles to a suitable pool of water where he will release them, Danum Valley Conservation Area, Borneo, Malaysia

Andy Rouse / Father and daughter watching Snow geese (Chen caerulescens) feeding in corn field, Bosque del Apache, New Mexico, USA

Mark Bowler / Silver arowana fish (Osteoglossum bicirrhosum) young fish are collected from the father fish who guards the young in his mouth and then released in a fish farm to grow until the price increases with d...

Mark Bowler / Silver arowana fish (Osteoglossum bicirrhosum) young fish are collected from the father fish who guards the young in his mouth and then released in a fish farm to grow until the price increases with d...

Mark Taylor / Maine Coon kitten, 8 weeks, and baby Dutch x Lionhead rabbit in a Father Christmas hat

Mark Taylor / Brown Roan Italian Spinone puppy, Riley, 13 weeks, wearing a Father Christmas hat

Mark Taylor / Black Labrador x Portuguese Water Dog puppy, Cassie, with Father Christmas hat on.

Mark Taylor / Baby Guinea pig in and wearing a Father Christmas hat.

Mark Taylor / Buff American Cocker Spaniel puppy, China, 10 weeks, sleeping beside Sandy Lionhead-cross rabbit, both wearing Father Christmas hats.

Mark Taylor / West Highland White Terrier, Betty, wearing a Father Christmas hat.

Mark Taylor / White-and-merle Border Collie-cross puppy, Ice, 14 weeks, wearing a Father Christmas hat, lying down

Mark Taylor / Two Black-and-white and grey-and-white kittens in a Father Christmas hat.

Mark Taylor / Yorkshire Terrier x Poodle puppy, Swede, with Father Christmas hat on.

Mark Taylor / Maine Coon kitten, 8 weeks, and baby Dutch x Lionhead rabbit in a Father Christmas hat.

Mark Taylor / Chocolate Standard Poodle puppy, Tara, 8 weeks, sitting, wearing a Father Christmas hat.

Mark Taylor / Two Maine Coon kittens, 8 weeks, in a Father Christmas hat.

Mark Taylor / Black-and-white kitten sleeping in a Father Christmas hat.

Mark Taylor / Sleepy Black-and-white and grey-and-white kittens in a Father Christmas hat.

Mark Taylor / Basset Hound puppy, Betty, 9 weeks, sitting, wearing a Father Christmas hat.

Kristel Richard / Two Indian men riding black Marwari stallions (father and son) in Rohet, Rajasthan, India, 2009

Hiroya Minakuchi / Emperor Penguin (Aptenodytes forsteri) parents and chick, Snow Hill Island, Antarctica

Jeff Rotman / Father and son dragger hold giant 45 pound Codfish (Gadus morhua) aboard dragger / trawler. Gloucester, Massachusetts, USA, North Atlantic Ocean. 2007 Model released.

Fred Bavendam / Weedy Seadragon (Phyllopteryx taeniolatus) male carrying eggs on tail, Kangaroo Island, Australia

Tim Laman / Tim Laman and Russell study their map while on the Hell's Bay Canoe Trail, Everglades National Park. Florida, USA. Model released, April 2008

Matthias Breiter / Bald Eagle (Haliaeetus leucocephalus) parents in nest with eaglet, Katmai National Park, Alaska

Matthias Breiter / Arctic Tern (Sterna paradisaea) parent feeding fish to chick, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) pair at nest site, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) pair at nest site, Hudson Bay, Canada

Fred Bavendam / Spotfin Jawfish (Opistognathus sp) male protectively incubating a clutch of eggs in his mouth, Manado, Sulawesi, Indonesia

Pete Oxford / Silver Teal (Anas versicolor) family swimming, Pebble Island, Falkland Islands

Flip Nicklin / Upland Goose (Chloephaga picta) family on shore, Falkland Islands

Piotr Naskrecki / Three-striped Poison Dart Frog (Ameerega trivittata) male carrying tadpoles, Brownsberg Reserve, Surinam

Piotr Naskrecki / Three-striped Poison Dart Frog (Ameerega trivittata) male carrying tadpoles, Brownsberg Reserve, Surinam

Donald M. Jones / Osprey (Pandion haliaetus) pair at nest with young, western Montana

Donald M. Jones / Northern Flicker (Colaptes auratus) male feeding young at nest cavity, western Montana

Eric Baccega / Silverback Mountain gorilla and baby gorilla (Gorilla beringei) feeding together, Volcanoes National Park, Rwanda, Africa

James Christensen / Common Rocket Frog (Colostethus inguinalis) male 'nurse' carrying tadpoles, Panama

James Christensen / Common Rocket Frog (Colostethus inguinalis) male 'nurse' carrying tadpoles, Panama

Kevin Schafer / Emperor Penguin (Aptenodytes forsteri) family, Antarctica

Kevin Schafer / Emperor Penguin (Aptenodytes forsteri) family, Weddell Sea, Antarctica

Jerry Monkman / A father and son hunting grouse and woodcock in a private forest in Jefferson, New Hampshire, USA.

Jerry Monkman / A young boy and his father hold salamander eggs from a vernal pool near Gulf Brook Ravine in Pepperell, Massachusetts, USA.

Kevin Schafer / Upland Goose (Chloephaga picta) male and female with chicks, Falkland Islands

Hanne & Jens Eriksen / Red / Grey phalarope {Phalaropus fulicarius} male with chick, Longyearbyen, Svalbard, Norway

Suzi Eszterhas / Black-backed Jackal {Canis mesomelas} six-week pup running with father, Masai Mara Triangle, Kenya

Ingo Arndt / Masai Giraffe (Giraffa tippelskirchi) mother, father and calf, Masai Mara, Kenya

Yukihiro Fukuda / Japanese macaque / Snow monkey {Macaca fuscata} male caring for 8-month-old young, Jigokudani, Nagano, Japan

Jane Burton / Tabby cat wearing a Father Christmas hat.

Jane Burton / Red tabby kitten in a Father Christmas hat.

Mark Taylor / Two Ginger kittens in a Father Christmas hat.

Mark Taylor / Grey kitten in a Father Christmas hat.

Mark Taylor / Two Black-and-white and grey-and-white kittens in a Father Christmas hat.

Mark Taylor / Lamb wearing a Father Christmas hat.

Mark Taylor / Pomeranian dog, Rikki, wearing a Father Christmas hat.

Mark Taylor / Two Tabby kittens in a Father Christmas hat.

Jane Burton / A playful tabby kitten pounces on a ginger kitten as he pokes his head out from a Father Christmas hat.

Mark Taylor / Orange roan Cocker Spaniel puppy, Blossom, wearing scarf and Father Christmas hat.

Mark Taylor / Buff American Cocker Spaniel puppy, China, 10 weeks old, asleep wearing a Father Christmas hat.

Jane Burton / West Highland White Terrier puppy in a Father Christmas hat.

Jane Burton / Ginger kitten, Benedict, in a Father Christmas hat, DIGITAL-FILM Composite

Mark Taylor / Black-and-white kitten in a Father Christmas hat.

Mark Taylor / Black kitten playing in a Father Christmas hat.

Mark Taylor / American Cockerpoo puppy, 8 weeks old, wearing a Father Christmas hat.

Mark Taylor / Two Ginger kittens in a Father Christmas hat.

Mark Taylor / German Shepherd Dog bitch puppy, Echo, wearing a Father Christmas hat.

Mark Taylor / Red / Golden English Cocker Spaniel, 5 months old, wearing a Father Christmas hat.

Mark Taylor / Maine Coon kitten, 8 weeks old, in a Father Christmas hat.

Jane Burton / Grey Spice kitten wearing a Father Christmas hat.

Mark Taylor / Burmese kitten in a Father Christmas hat.

Mark Taylor / Chocolate Cocker Spaniel puppy, Cadbury, 12 weeks old, and Lionhead rabbit with Father Christmas hats on.

Mark Taylor / Tabby kitten in a Father Christmas hat playing with a toy mouse.

Mark Taylor / Guinea-pig wearing a Father Christmas hat.