Mallard duck with her ducklings, Cotswolds, England

Mallard ducklings, Cotswolds, England

Mallard ducklings just two days old, Cotswolds, England

Mallard duck and drake with their ducklings

Mallard duck with her twelve ducklings in an English country garden

Two old Orthodox Jews sitting praying at the Western or Wailing Wall in the Old City of Jerusalem, Israel, Middle East

View of World War Two Memorial detail, Washington D.C., United States of America, North America

Image taken with a Holga medium format 120 film toy camera of two old boats by lake side, Derwentwater, Lake District National Park, Cumbria, England, United Kingdom, Europe

Two hundred year old mosque of Ba Sounou Sacko, Sekoro, old Segou, first capital of the Bambara kingdom, Mali, Africa

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

Mother brown bear (Ursus arctos) foraging for sockeye salmon with two year-old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Chinstrap penguin (Pygoscelis antarctica) chick head detail at colony on Useful Island near the Antarctic Peninsula. There are an estimated 2 million breeding pairs of chinstrap penguins in the Antarctic peninsula region alone, perhaps as many as 7.5 million breeding pairs in all of Antarctica. Their name derives from the narrow black band under their heads which makes it appear as if they are wearing black helmets, making them one of the most easily identified types of penguin. Other names for them are "Ringed Penguins", "Bearded Penguins", and "Stonecracker Penguins" due to their harsh call. They grow to 68 cm (27 in). The average adult weight of a Chinstrap Penguin is 4.5 kg (10 lbs). Weight can range from 3 to 6 kg (6.6-13.2 lbs), with males being slightly larger and weight varying based on where the penguin is in the breeding cycle. Their diet consists of krill, shrimp, and fish. On land they build circular nests from stones, and lay two eggs, which are incubated by both the male and the female for shifts of five to ten days. They can also breed on icebergs, though they prefer non-icy conditions. The chicks hatch after about 35 days, and have fluffy gray backs and white fronts. The chicks stay in the nest for 20?30 days before they go to join a creche. At around 50?60 days old, they moult, gaining their adult plumage and go to sea. The Chinstrap Penguin was first described by German naturalist Forster in 1781. Its specific epithet was often seen as antarctica, however a 2002 review determined the genus Pygoscelis was masculine, and hence the correct binomial name is Pygoscelis antarcticus.

Rissos Dolphin (Grampus griseus) adult and very young calf surfacing. Monterey, California, Pacific Ocean. MORE INFO: This calf still displays foetal folds from when it was curled up inside the womb. It is probably only a couple of weeks old.

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

A curious brown bear (Ursus arctos) two year-old near the parking lot at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, adult female with 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Mother brown bear (Ursus arctos) foraging for sockeye salmon with two year-old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgaarh Tiger Reserve

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Mother brown bear (Ursus arctos) foraging for sockeye salmon with two year-old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, adult female with 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

A curious brown bear (Ursus arctos) two year-old near the parking lot at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, adult female with 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Newquay, Wales, UK

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Mother brown bear sow (Ursus arctos) feeding near her two year-old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Newquay, Wales, UK

Mother brown bear (Ursus arctos) foragong for sockeye salmon with two year-old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean.

Plaza de la Constition, 08/04/2009, local men sitting. Santa Cruz, Tenerife Island. Canary Islands, Spain, Espa–a

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Mother brown bear sow (Ursus arctos) mock fighting with her two-year old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Mother brown bear (Ursus arctos) foraging for sockeye salmon with two year-old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Mother brown bear sow (Ursus arctos) mock fighting with her two-year old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Mother brown bear sow (Ursus arctos) at the board walk with her two-year old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Mother brown bear sow (Ursus arctos) mock fighting with her two-year old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Mother brown bear sow (Ursus arctos) mock fighting with her two-year old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, adult female with two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, adult female with 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Mother brown bear sow (Ursus arctos) feeding near her two year-old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Mother brown bear sow (Ursus arctos) mock fighting with her two-year old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Mother brown bear sow (Ursus arctos) mock fighting with her two-year old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, adult female with two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Mother brown bear (Ursus arctos) foraging for sockeye salmon with two year-old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Mother brown bear sow (Ursus arctos) mock fighting with her two-year old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Mother brown bear sow (Ursus arctos) feeding near her two year-old cub at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Adult gentoo penguin (Pygoscelis papua) feeding minutes-old newly hatched chick at Gold Harbor on South Georgia, Southern Ocean

Older couple sitting at the edge of swimming pool

Older couple relaxing on modern backyard patio

Older couple toasting on modern backyard patio

Black couple hugging in park

Caucasian women walking dog on dirt path

Caucasian grandfather and granddaughter using digital tablet

Caucasian women sitting with dog on hilltop

Older couple toasting on modern backyard patio

Older couple relaxing in swimming pool

Older couple using digital tablet on modern backyard patio

Couple toasting with wine and laughing

Couple hugging outdoors and enjoying wine and cocktail

Caucasian couple toasting near swimming pool

Couple enjoying wine at waterfront

Smiling couple toasting with wine

Portrait of older couple relaxing in swimming pool

Businesswoman writing on whiteboard in meeting

Older Caucasian couple on beach with surfboards kissing

Older Caucasian couple standing on beach holding surfboards

Older Caucasian couple leaning on convertible car with surfboards

Older Caucasian couple on beach with surfboards

Older Caucasian couple in convertible car with surfboards on beach

Doctors walking and talking outdoors at hospital

Caucasian women hugging in restaurant

Older Caucasian couple on standing near convertible car with surfboards

Older Caucasian couple leaning on convertible car with surfboards

Grandmother and granddaughter holding hands and walking in city

Friends playing chess in garden

Black couple sitting on stone staircase

Caucasian grandfather and grandson walking in field

Black couple cutting wedding cake

Caucasian man helping woman crossing forest river

Caucasian farmer lifting bale of hay

Portrait of smiling Caucasian grandfather and grandson at truck

Older Japanese mother and daughter walking on nature path

Black couple sitting on stone staircase

Flower petals falling on Black newlyweds