People walk across snow-covered Hampstead Heath, London, United Kingdom

Winter snow scene in The Cotswolds, UK

Reindeer herd in the snow in arctic landscape at Kval?ysletta, Kvaloya Island, Tromso in Arctic Circle Northern Norway

Snow covered trees on Hampstead Heath, London, United Kingdom

Hoar frost on tree and field in frosty wintry landscape in The Cotswolds, Oxfordshire, UK

Hoar frost on winter's day in woodland in The Cotswolds, Gloucestershire

Glacier detail in Icy Arm, Baffin Island, Nunavut, Canada, North America

Winter scene hoar frost ice crystals on Portugese laurel bush in The Cotswolds, UK

Snow-capped mountains and steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America

Couple walk hand in hand across snow-covered Hampstead Heath, North London, United Kingdom

Hoar frost on winter's day in woodland in The Cotswolds, Gloucestershire

Woman walks dog on winter's day across snow-covered Hampstead Heath, North London, England, United Kingdom

Winter scene hoar frost on fir tree in The Cotswolds, UK

Hoar frost on winter's day in woodland in The Cotswolds, Gloucestershire

Traditional telephone box in the village of Swinbrook, The Cotwolds

Glacier detail in Icy Arm, Baffin Island, Nunavut, Canada, North America

Couple looking at the London skyline at the Observation Point near Kenwood on Hampstead Heath, London

Traditional cottage during snowy weather in the village of Swinbrook, The Cotwolds

Man exercises in snow-covered Hampstead Heath, North London, England, United Kingdom

Winter landscape with hoarfrost, steeming river, brilliant sunshine and blue sky, utah, usa

View through an icy pressure ridge of emperor penguin colony on Weddell Sea, Dawson Lambton Glacier, Antarctica, Polar Regions

Winter landscape with hoarfrost, steeming river, brilliant sunshine and blue sky, utah, usa

Barb wire fence in winter landscape with hoarfrost, steeming river, brilliant sunshine and blue sky, utah, usa

Barb wire fence in winter landscape with hoarfrost, steeming river, brilliant sunshine and blue sky, utah, usa

Matterhorn reflecting in mountain lake, Wallis, Schweiz

A frozen Stickle Ghyll above the Langdale Valley in the Lake District, Cumbria, England, United Kingdom, Europe

Matterhorn reflecting in mountain lake, Wallis, Schweiz

Matterhorn reflecting in mountain lake, Wallis, Schweiz

Matterhorn reflecting in mountain lake, Wallis, Schweiz

Winter landscape with hoarfrost, steaming river, brilliant sunshine and blue sky, utah, usa

Matterhorn reflecting in mountain lake, Wallis, Schweiz

A pod of at least 8 Orcas (Orcinus orca) encountered off George Island near Inian Pass and followed until Lemesieur Island in Icy Strait, Southeast Alaska

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.

An adult humpback whale (Megaptera novaeangliae) head-lunging off Point Adolphus in Icy Strait in Southeast Alaska, USA. Pacific Ocean

An adult humpback whale (Megaptera novaeangliae) breaching off Point Adolphus in Icy Strait in Southeast Alaska, USA. Pacific Ocean

Grasmere lake in the Lake District National Park, iced over during a cold snap in December 2010, Cumbria, England, United Kingdom, Europe

Iceberg calved from Dawes or Sawyer Glaciers grounded on the terminal morraine in southeast Alaska, USA.

Wansfell on the side of Kirkstone Pass with snow and spindrift being blown across the hill side, Lake District, Cumbria, England, United Kingdom, Europe

Lamplugh Glacier showing meltwater cave, Glacier Bay National Park, southeast Alaska, USA.

Lamplugh Glacier showing meltwater cave, Glacier Bay National Park, southeast Alaska, USA.

Red Screes and the Kirkstone Pass road blocked by snow in the Lake District, Cumbria, England, United Kingdom, Europe

Icebergs and bergy bits that have calved off the Sawyer tidewater Glacier in Tracy Arm, Southeast Alaska, USA.

Icebergs and bergy bits that have calved off the Sawyer tidewater Glacier in Tracy Arm, Southeast Alaska, USA.

South Sawyer Glacier with icebergs/bergy bits calved off in Tracy Arm, Southeasat Alaska, USA. Pacific Ocean.

A pod of at least 8 Orcas (Orcinus orca) encountered off George Island near Inian Pass and followed until Lemesieur Island in Icy Strait, Southeast Alaska

Sunset over the snow-capped mountains of the Fairweather Range across Icy Strait in Southeast Alaska, USA, Pacific Ocean.

Iceberg/bergy bits calved off Sawyer Glacier in Tracy Arm, Southeasat Alaska, USA. Pacific Ocean.

Icebergs and bergy bits that have calved off the Sawyer tidewater Glacier in Tracy Arm, Southeast Alaska, USA.

A pod of at least 8 Orcas (Orcinus orca) encountered off George Island near Inian Pass and followed until Lemesieur Island in Icy Strait, Southeast Alaska

St. Sunday Crag in winter in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Loughrigg in winter weather, Lake District, Cumbria, England, United Kingdom, Europe

The Lindblad Expedition ship MS Endeavour in Paradise Bay on the Antarctic Peninsula.

Hoar frost on trees on the Beacon near Loughborough, Leicestershire, England, United Kingdom, Europe

The Northern Cliffs of Ben Nevis plastered in snow Scotland, United Kingdom, Europe

Reflections and snow covered mountains in Lemaire Channel in Antarctica.

Reflections and snow covered mountains in Lemaire Channel in Antarctica.

LeMaire Channel on the Antarctic Peninsula.

Sawyer Glacier with icebergs/bergy bits calved off in Tracy Arm, Southeasat Alaska, USA. Pacific Ocean.

Rydal Water in the Lake District completely frozen over during December 2010, Cumbria, England, United Kingdom, Europe

Adult Humpback Whale (Megaptera novaeangliae) fluke-up dive in Icy Strait, Southeast Alaska, USA.

A climber on the Aonach Eagach ridge in Scotland, United Kingdom, Europe

A snow plough trying to keep Kirkstone Pass open in the snow, Lake District, Cumbria, England, United Kingdom, Europe

Loughrigg in winter weather, Lake District, Cumbria, England, United Kingdom, Europe

Footsteps of walker who crossed Derwent Water at Keswick in the Lake District when it was completely frozen over during December 2010, Cumbria, England, United Kingdom, Europe

Outer Mongolia from the air, Mongolia, Central Asia, Asia

Outer Mongolia from the air, Mongolia, Central Asia, Asia

Two humpback whales (Megaptera novaeangliae) swimming in front of an icy coastline. Cuverville Island, Antarctica

Derwent Water at Keswick in the Lake District completely frozen over during December 2010, Cumbria, England, United Kingdom, Europe

A field in Troutbeck with snow and spindrift being blown across the hill side, Lake District, Cumbria, England, United Kingdom, Europe

An adult bull from a pod of at least 8 Orcas (Orcinus orca) encountered off George Island near Inian Pass and followed until Lemesieur Island in Icy Strait, Southeast Alaska

A group of adult humpback whales (Megaptera novaeangliae) feeding along the south side of Icy Strait in Southeast Alaska, USA

Sunrise on Icy Strait in Southeast Alaska in the springtime, USA, Pacific Ocean.

Snow and ice covered mountains in Paradise Bay on the Antarctic Peninsula.

Trees over mountain lake

Caucasian father and daughter playing in snowy field

Distant people kayaking near glacier

Fog on snowy mountain range

Reflection of clouds in still mountain lake

Reflection of clouds in still mountain lake

Reflection of clouds in still mountain lake

Polar bear standing on glacier

Man hiking on mountain in winter

Woman and polar bear standing on glacier

Snow on remote rock formations, Myrdalsjokull Glacier, South Iceland, Iceland

Waves on beach

Frost on branches in winter forest

The jagged face of Perito Moreno Glacier and Lago Argentino in Los Glaciares National Park near El Calafate, Argentina. A UNESCO World Heritage Site in the Patagonia region of South America. Icebergs from calving ice from the glacier float in the lake. In the distance at left is Cerro Gardener.

Perito Moreno Glacier and Lago Argentino in Los Glaciares National Park near El Calafate, Argentina. A UNESCO World Heritage Site in the Patagonia region of South America. At right is Cordon Reichert.

Detail images of the Perito Moreno Glacier in Los Glaciares National Park in the Patagonia region of Argentina, at the southern tip of South America. A UNESCO World Heritage Site in Patagonia.

Perito Moreno Glacier and Lago Argentino in Los Glaciares National Park near El Calafate, Argentina. A UNESCO World Heritage Site in the Patagonia region of South America. At right is Cordon Reichert with the peak of Cerro Moreno at left.

A panoramic view of Perito Moreno Glacier in Los Glaciares National Park near El Calafate, Argentina. A UNESCO World Heritage Site in the Patagonia region of South America. At left is Cerro Moreno and the Cordon Reichert at right. In the background are Cerro Gardener, Teniente Iglesias and Cerro Dos Picos.

The jagged face of Perito Moreno Glacier and Lago Argentino in Los Glaciares National Park near El Calafate, Argentina. A UNESCO World Heritage Site in the Patagonia region of South America. Icebergs from calving ice from the glacier float in the lake. In the distance is Cerro Gardener.

2006 Nebraska Ice Storm

2006 Nebraska Ice Storm

2006 Nebraska Ice Storm

2006 Nebraska Ice Storm

Tourist exploring an ice cave on adventure vacation at Breidamerkurjokull Glacier, Vatnajokull Ice Cap, Iceland, Europe

Drinking glacial water on while on a glacier hike on Breidamerkurjokull Glacier, Vatnajokull Ice Cap, Iceland, Europe

Trossachs National Park Scotland UK

Trossachs National Park Scotland UK