The week in wildlife

An Adelie penguin in Cape Burks, western Antarctica. Adelie penguins (Pygoscelis adeliae) are found in the Southern Ocean round Antarctica, and breed further south than any other species of penguin
Photograph: Yonhapnews Agency/EPA

Norway: A pair of stranded deer on a frozen lake. Ivar Skregelid and his son Eivind Skregelid braved the ice to edge their way across the 160m-deep Sirdal Lake to rescue the deer
Photograph: Tor Sindre Tjomlid/Rex Features

Minsk, Russia: A swan stretches its wings on a frozen lake
Photograph: Viktor Drachev/AFP/Getty

The British Indian Ocean territory of the Chagos islands is the UK's greatest area of marine biodiversity, home to at least 220 coral species and more than 1,000 species of fish. This week the 10,000th person joined a campaign to create the Earth's biggest marine protected area in the Chagos archipelago
Photograph: Anne and Charles Sheppard/Chagos Conservation Trust

Istanbul, Turkey: A squirrel in Yildiz park
Photograph: Ibrahim Usta/AP

A zebra finch. This week, scientists recreated the colourful plumage of some of the earliest dinosaurs to grow feathers. They now believe that feathers evolved primarily for ornamental reasons and only later became adapted for insulation and flight
Photograph: AFP/Getty Images

The World Bank has warned a 13-nation tiger summit that privately run tiger farms are inhumane and fuel demand for the endangered big cat's bones and skin
Photograph: Aditya Singh/AFP

Santiago, Chile: A young Darwin's frog (Rhinoderma Darwinii), climbs on on dry leaves at a breeding centre in Concepcion University. The first frog of this species born in captivity was shown at the university this week. Scientists hope the breakthrough will be the key to repopulating the nearly extinct species
Photograph: Reuters

Guerrero Negro, Mexico: A pair of ospreys nest on the top of a pole
Photograph: Alexandre Meneghini/AP

UK: Border Agency officers seized over a tonne of live rock coral at Manchester airport. The animals, which are protected under the Convention on International Trade In Endangered Species (Cites), were discovered in air freight which originated in Indonesia
Photograph: Manchester Evening News Syndication

Ahmedabad, India: A wading bird in the polluted waters of the Sabarmati river
Photograph: Ajit Solanki/AP

A humpback whale breaching in waters off Hook Head, Co Wexford, Ireland
Photograph: Padraig Whooley/PA