The week in wildlife - in pictures

A toucan rests on a branch in the Braullio Carrillo National Park. According to a recent poll, Costa Ricans would agree to pay higher taxes if it is used for actions to promote the environment, according to local media. Costa Rica has more than 30% of its territories held in national parks Photograph: Juan Carlos Ulate/Reuters

Fish in the acuarium of the National Biodiversity Institute in Heredia, Costa Rica Photograph: Rodrigo Arangua/AFP/Getty Images

A water strider walks on the Spiegelteich lake near Marktleugast, Germany Photograph: David Ebener/EPA

A dead terrapin near the shores of Lake Xolotlan, also known as Lake Managua, which has an area of approximately 1000 sq km and has been receiving raw sewage from Managua's 1 million residents since 1920. World Environment Day is celebrated annually on 5 June to raise global awareness about environmental issues and stimulate political action, according to the United Nations Environment Programme Photograph: Oswaldo Rivas/REUTERS

An Indian myna holds a grasshopper in its beak to feed chicks in a nest built inside the wall of an underpass in Greater Noida on the outskirts of New Delhi Photograph: Parivartan Sharma/Reuters

A bison, often referred to as an American buffalo, in Jackson, Wyoming, US, with the Grand Teton mountains in the background. The bison has been nominated as national mammal Photograph: Alex Pitt/ZUMA Press/Corbis

A Laysan albatross on Midway Atoll Photograph: Marco Garcia/Reuters

This photo shows exotic mussels attached to a dock float that washed up on Agate Beach near Newport, Ore. State authorities are considering how to dispose of the millions of marine creatures that hitchhiked across the Pacific Ocean aboard the dock float torn loose from a Japanese fishing port by the 2011 tsunami so they will not compound the problem of invasive species Photograph: AP

A bee approaches an indigenous coastal gynbos flower in Cape Town, South Africa. Honey and wax from hives are used for food, cosmetics and medicines. Bees are threatened by a combination of various factors, deforestation, mites, Colony Collapse Disorder and industrial agriculture Photograph: Nic Bothma/EPA

One of the smuggled Philippine sailfin lizards inside an aquarium returned by the Hong kong government for care and rehabilitation before their possible release to their natural habitat. Five Philippine sailfin lizards were returned in the country on 7 June by Hong Kong officials Photograph: DENNIS M. SABANGAN/EPA

Charred trees from a forest fire in the Whitewater-Baldy Complex in New Mexico dominate the landscape Photograph: Kari Greer/US Forest Service/REUTERS

A duck swims in the duckweed-covered water of the Yueya Lake in Nanjing, capital of east China's Jiangsu Province. Duckweed has blanketed northern areas of the lake recently Photograph: Corbis

A tiger rests in a pond in Rathambhore Tiger Reserve in Rajasthan State, north India Photograph: Li Yigang/Corbis

A bird resting on a lotus flower at Taipei Botanical Garden in Taipei, Taiwan Photograph: Wu Ching-teng/Corbis

A horseshoe crab scuttles past plastic wrapping on Big Wave Bay beach, Hong Kong, China. Horseshoe crabs numbers have been in rapid decline in Hong Kong and have become extinct in some local areas due to marine pollution and coastal development Photograph: Paul Hilton/EPA

Poppyseed flowers under a dark sky with rain clouds at the national park near Criewen, Germany Photograph: PATRICK PLEUL/EPA

A lizard eats an insect in the Braullio Carrillo National Park, Costa Rica Photograph: Juan Carlos Ulate/Reuters

Two silver-studded blue butterflies in Lofer, Salzburg Photograph: Kerstin Joensson/AP

A fawn breasted birillant at the private reserve of Paz de las Aves (Peace of the Birds) near Nanegalito, Ecuador Photograph: Rodrigo Buendia/AFP/Getty Images