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Pictures of the week: From a protective mother to a competitive Duchess

Here's our pick of the pictures around the world this week...

This is the incredible moment a protective mother came to the rescue of her vulnerable calf as it was preyed upon by a pack of hyenas. The angry elephant charged at the hungry animals - and was successful at saving her baby. The amazing picture was captured by Jayesh Mehta in the Savuti region of the Chobe national park in Botswana (Caters)

Two people sit on a bench in a flooded park in Buenos Aires. Catastrophic flash floods have killed at least 57 people in unseasonable weather in Argentina (Reuters)

U.S. President Barack Obama pulls a funny face while playing tennis during the 135th annual Easter Egg Roll at the White House in Washington (Reuters)

A lone child walks among debris and rubble strewn across a street as a result of intense fighting in Deir al-Zor, Syria. The United Nations has warned it will soon run out of money to cope with the exodus of Syrian refugees fleeing across the borders to safety (Reuters)

Soldiers of the U.S. Army 23rd chemical battalion give a demonstration of their equipment at Camp Stanley in Uijeongbu, north of Seoul. Tensions are high after North Korea made threats of war against its southern neighbour and the US (Reuters)

Pedestrians and New York's iconic yellow taxis are seen from the observatory of One World Trade Center, built at the Ground Zero site in New York City (Photo by Spencer Platt/Getty Images)

The Solaris Building in Singapore is treated to a unique extension by '3D Joe and Max', street artists who used chalk to produce a stunning 3D illusion (3D Joe and Max / Rex Features)

A bird's eye view shows rice paddy fields glowing gold in the sunlight in Guangxi Zhuang, China (ZUMA / Rex Features)

Residents are stumped after council workers painted the UK's shortest double yellow lines - measuring a miniscule 13in - onto their street in Cambridge. Motorists will be fined £50 to £70 if they misjudge their parking in Humberstone Road, Cambridge (Geoffrey Robinson / Rex Features)

Monks release glowing lanterns during the Loy Krathong Buddhist Festival in Chiang Mai, Thailand (Photo by Daniel Nahabedian, Chiang Mai, Thailand)