The Observer's 20 photographs of the week

Diego Azubel photographed the cultural production 'Impression Lijiang'. Local performers from the Naxi, Yi and Bai ethnic minorities perform beneath the Jade Dragon Snow Mountain in Lijiang, Yunnan province, China. It is the highest altitude production ever staged Photograph: Diego Azubel/EPA

Members of the Naxi Ancient Music orchestra perform on stage in Lijiang. Naxi music was born between 1382 and 1383, during the Ming Dynasty when soldiers were sent to Yunnan and subsequently decided to lay down their roots. With less than 100 musicians still able to play, and most of them above 60 years of age, the ancient Naxi music faces extinction Photograph: Diego Azubel/EPA

J E Tudor falls off Silverburn at the famous Becher's Brook fence at Aintree. The horse Bold Addition (centre) also falls in the John Smith's Fox Hunters Steeplechase during the Grand National meeting Photograph: Tom Jenkins/Guardian

A grasshopper on a grass stalk emerges from its old skin, leaving a replica of itself behind. Adhi Prayoga photographed the delicate 40-minute process in his back garden in Mataram, Indonesia Photograph: Adhi Prayoga/Solent News

The aurora borealis is photographed over a beach by media analyst Larry Gerbrandt. He braved temperatures of minus 20 degrees and icy winds of up to 40mph to capture the natural light Photograph: Larry Gerbrandt/Barcroft

A heat lamp keeps two one-day old lambs warm at Gwndwnwal Farm in Brecon, Wales. The recent cold snap has meant that farmers have had to continue feeding their sheep long into the period when they would normally be able to survive on grass Photograph: Chris Jackson/Getty

Bernat Armangue was in the West Bank city of Hebron, capturing the clashes between Palestinians and Israeli forces. Here, a Palestinian stone-thrower lies on the ground during the protest. Demonstrations erupted across the West Bank on Tuesday over the death of a Palestinian prisoner Photograph: Bernat Armangue/AP

A Palestinian protester kicks a burning tyre during the clashes with Israeli forces Photograph: Bernat Armangue/AP

At the Santiago Bernabéu stadium in Madrid, Galatasaray supporters light flares during the Champions League's quarter-final clash with Real Madrid Photograph: Curto De La Torre/AFP

A resident uses a bucket of water to put out a fire in a house owned by a member of the Kikuyu ethnic group in Nairobi, Kenya. The house was torched by protesters who support defeated presidential candidate and outgoing prime minister Raila Odinga Photograph: Dai Kurokawa/EPA

Models in costume get ready for a fashion show – Fairy Tale and Legends – at Edinburgh University Photograph: David Cheskin/PA

A Kashmiri woman walks in a tulip garden on the outskirts of Srinagar, India. Kashmir, known for its mountains, lakes, forests and moderate weather was one of Asia's most popular tourist destinations until a Muslim separatist rebellion broke out in the region in 1989 which has claimed more than 60,000 lives Photograph: Mukhtar Khan/AP

A leopard trapped in a well looks up to forest officials at the Kamakhya temple in Gauhati, India. Forest officials tranquilised the leopard before rescuing it Photograph: Anupam Nath/AP

Bahraini protestors run for cover from teargas fired by riot police following the funeral of Abd Al-Ghani al-Rayes in the village of Diraz. Al-Rayes, who was 66, died in front of a police station as he was trying to find out what happened to his arrested son Photograph: Mohammed Al-Shaikh/AFP

Beyoncé and her husband Jay-Z are surrounded by bodyguards as they tour Old Havana on their fifth wedding anniversary Photograph: Ramon Espinosa/AP

People photograph the treasury building at Petra in Jordan Photograph: Adam Pretty/Getty

Monica Briceno packs her belongings as she waits to be evicted from her home in Madrid. She has Alzheimer's disease and has been living in the apartment since 1974. The landlord wants to evict her claiming he needs the apartment for relatives, as the law allows Photograph: Andres Kudacki/AP

US soldiers of the 23rd chemical battalion wear anti-chemical suits near a mock bomb at a ceremony to recognise their official return to South Korea Photograph: Lee Jin-man/AP

Marco Longari, another regular contributor to the 20 photographs of the week, was also in Hebron. Here he photographs a Palestinian demonstrator throwing a petrol bomb towards Israeli security forces Photograph: Marco Longari/AFP

Israeli soldiers walk toward a cloud of teargas during clashes with Palestinian stone throwers at the al-Arub refugee camp Photograph: Marco Longari/AFP