The week in wildlife

A Canada goose gosling is seen along the banks of the Schuylkill river in Philadelphia Photograph: Matt Rourke/AP

A dead fish in the algae-filled Dianchi Lake in Kunming, China Photograph: Rex Features

An albatross flies over Floreana Island in the Galapagos Islands, Ecuador. The islands were included on a list of natural patrimonies that are in danger due to damage caused by invading species and tourism Photograph: Dolores Ochoa/AP

An elephant from the Aberdare Ranges national park is seen behind an electric fence that is probably the longest conservation barrier in the world. Its 250 miles (400km) stretches over hills, passes over rivers and runs along the edges of hundreds of communities Photograph: The Guardian

A carpenter bee forages for pollen on an azalea shrub in Wilmington, Delaware Photograph: Tim Shaffer/Reuters

A foot of a cloned fluorescent dog, Ruppy, a seventeen-month-old beagle, glows in the dark under ultra-violet light at Seoul National University's College of Veterinary Medicine. The world's first transgenic dogs carry fluorescent genes, after scientists took a fluorescent protein, much like that produced by some sea anenomes, and inserted it into the cell of a beagle Photograph: Jo Yong-hak/Reuters

A diver explores dead coral reefs in Gili Trawangan at Indonesia's Lombok island. South-east Asia's biologically diverse coral reefs will disappear by the end of this century, wiping out coastal economies and sparking civil unrest if climate change is not addressed, conservation group WWF says Photograph: Stringer/Indonesia/Reuters

Dyeing Poison Dart Frogs are seen at the National Zoo in Washington. Scientists say frog species are in danger from the spread of a chytrid fungus that is killing amphibians at an alarming rate. The Amphibian Rescue and Conservation Project, announced this week, hopes to stop the spread of the fungus Photograph: Jacquelyn Martin/AP

Two young fallow deer make their way across a farmer's field in Watlington, Oxfordshire Photograph: Dan Kitwood/Getty Images

Sea lions swim in front of the Palomino islands, some 8 km (5 miles) from Callao's Port on the central coast of Peru. A colony of 8,000 sea lions lives on desert islands in the bay of Lima. They spend most of the day lounging on rocks or catching fish Photograph: Enrique Castro-mendivil/guardian.co.uk

The city of Geoje, South Gyeongsang province, plans to push for artificial breeding of buprestids, a rare and protected type of beetle, over the next five years Photograph: Yonhap/EPA

A mandarin duck stands next to a pond surrounded by flowering azaleas and rhododendron in the Isabella Plantation in Richmond Park, south-west London Photograph: Stephen Hird/Reuters

A morpho butterfly flies above the tearoom of Galleria Borghese's aviary, Rome. The gardens are hosting a springtime event called Tea With the Butterflies, which allows visitors to sip tea in an atrium filled with the colourful insects Photograph: Chris Helgren/Reuters

The top of a dandelion seed head in the morning light in Marysville Photograph: Carolyn Kaster/AP

An iguana sunbathes in Puerto Ayora on Santa Cruz Island in the Galapagos Islands, Ecuador Photograph: Dolores Ochoa/AP

One of the mountain gorillas of Uganda to be protected under the scheme of Dr Gladys Kalema-Zikusoka, a TV vet who won £60,000 in the Whitley conservation awards Photograph: Whitley conservation

Blossoming narcissuses in Narcissus Valley in the Carpathian reserve, Ukraine. Some 100 hectares of the flowers grow in the popular reserve Photograph: Olexander Zobin/AFP/Getty Images