The week in wildlife

A bee collects pollen from the stamens of a flowering crocus in the Royal Botanic Gardens at Kew in London. The unusually cold winter in the UK has delayed the flowering of many spring plants by up to one month Photograph: Oli Scarff/Getty Images Photograph: Oli Scarff/guardian.co.uk A bar-coded tree in a rainforest in Liberia. Its forests, once ravaged for blood timber sold to fund one of Africa's bloodiest civil wars, are being primed as a lucrative and legal industry using cutting-edge tracking technology. Electronic tags – similar to bar codes used on consumer products – are attached to trees in the woodlands covering 45% of the west African nation, a process that will allow consumers to trace the end-product right back to the stump Photograph: Glenna Gordon/AFP/Getty Images Photograph: Glenna Gordon/guardian.co.uk An Olive Ridley turtle digs in the sand to lay its eggs on Rushikulya beach, Orrissa. Thousands of Olive Ridley sea turtles came ashore this week from the Bay of Bengal to lay their eggs on this beach, one of the three mass nesting sites in the Indian coastal state Photograph: Deshakalyan Chowdhury/AFP/Getty Images Photograph: Deshakalyan Chowdhury/guardian.co.uk A herder on horseback searches for his livestock along the frozen landscape in Bayantsogt, Tuv province in Mongolia. Mongolia is still experiencing one of the worst winters in 30 years. The government has declared an emergency requiring foreign aid to alleviate the impact of the zud (a multiple natural disaster) caused by bitter cold and thick snow. The United Nations Development Programme estimate 2.7m livestock have perished already, but believe that figure will double by the end of June. The UNDP is working with other UN agencies to provide a programme in which herders will receive income to bury the carcasses of livestock in an effort to prevent spread of disease and pollution once the snow begins to melt Photograph: Paula Bronstein/Getty Images Photograph: Paula Bronstein/guardian.co.uk A tiger lies in a cage during an opening ceremony of a project to raise money for starving tigers in Shenyang zoo, Liaoning province. The zoo was closed after the deaths of 11 Siberian tigers and allegations of supplying the illegal tiger-bone trade Photograph: Sheng Li/Reuters Photograph: Sheng Li/guardian.co.uk Hare boxing is not always males fighting over a female, as is often assumed. A boxing match is more often a doe about to come into heat resisting untimely advances from a buck. Does also resist bucks who are low in the hierarchy, and the fight is a test of his determination Photograph: Angus Blackburn/Rex Features Photograph: Angus Blackburn/guardian.co.uk A king penguin at Fortuna Bay, a sub-Antarctic island of South Georgia, about 860 miles off the Falklands. Black in colour, the penguin is believed to be displaying a pigmentation condition known as melanism. Males and females differ in behaviour and in susceptibility to disease Photograph: Sisse Brimberg & Cotton Coulson/Getty Images Photograph: Sisse Brimberg & Cotton Coulson/guardian.co.uk Shark fishermen unloading their catch and cutting off their fins in Ecuador. The practice, which involves slicing fins from sharks at sea and dumping their bodies overboard – often while still alive – has been heavily criticised by campaigners and blamed for pushing many shark species to the brink of extinction Photograph: KPA/Zuma/Rex Features Photograph: KPA/Zuma/guardian.co.uk This image provided by Nasa shows a small shrimp-like creature at a depth of 600ft beneath the West Antarctic ice sheet. The creature, a three-inch long lyssianasid amphipod, was found beneath the Ross ice shelf, about 12.5 miles away from open water. Scientists were using a borehole camera to look back up towards the ice surface when they spotted it swimming beneath the ice Photograph: NASA/AP Photograph: NASA/guardian.co.uk Snow crystals transform trees on the Brocken mountain, eastern Germany, which is still covered with 80 cm of snow Photograph: ECKEHARD SCHULZ/AFP/Getty Images Photograph: ECKEHARD SCHULZ/guardian.co.uk A seagull flies over the Bosphorus in Istanbul Photograph: Mustafa Ozer/AFP/Getty Images Photograph: Mustafa Ozer/guardian.co.uk High tide waves wash over some of the thousands of starfish that have been washed up on the beach in Devon, England. Marine experts believe the starfish are susceptible to high tides and storms after becoming exhausted spawning. Similar events happen once or twice a year in the UK Photograph: Matt Cardy/Getty Images Photograph: Matt Cardy/guardian.co.uk Almost 10% of Europe's butterflies face extinction , according to the IUCN. Insects have been hit by loss of grassland habitats because of intensification of agriculture and abandonment of farming land. The demoiselle damselfly ( Calopteryx virgo meridionalis ), often found near fast-flowing waters, is another species whose numbers are shrinking fast Photograph: Jean Pierre Boudot/IUCN Photograph: Jean Pierre Boudot/guardian.co.uk The flat-headed cat ( Prionailurus planiceps ) is one of the world's least known, highly threatened felids with a distribution restricted to tropical lowland rainforests in peninsular Thailand, Malaysia, Borneo and Sumatra. Despite an increasing number of camera-trapping field surveys for carnivores in south-east Asia during the past two decades, few of these studies have captured the flat-headed cat Photograph: PLoS ONE Photograph: guardian.co.uk A protective mother hippopotamus charges when a tourist group gets too close at iSimangaliso wetland park, St Lucia, South Africa. A study released this week by a researcher at the University of Newcastle found that bottlenose dolphins living off the coast of Zanzibar were experiencing 'incredible' stress caused by pleasure boats packed with holidaymakers Photograph: Avi Hirschfield/Rex Features Photograph: Avi Hirschfield/guardian.co.uk More than 300 southern right whales, most of them young calves, have been found dead in the last five years in the waters off Argentina's Patagonian coast - one of the most important breeding grounds for the species. Experts met this week to examine possible causes Photograph: G. Harris/WCS Photograph: G. Harris/guardian.co.uk The one-month-old lion cub Mello rests his head on his mother's paw at Prigen safari park in Indonesia Photograph: Trisnadi/AP Photograph: Trisnadi/guardian.co.uk A dead fish floats near the shore of the Salton Sea, California Photograph: Paul Buck/EPA Photograph: Paul Buck/guardian.co.uk