The Calbuco volcano erupts near Puerto Varas, Chile, on April 22, 2015. The volcano erupted billowing a huge ash cloud over a sparsely populated, mountainous area in southern Chile. #

Pramac Ducati Racing rider Yonny Hernandez of Colombia rides his motorcycle as fire erupts beneath it during Argentina's MotoGP Grand Prix at the Termas de Rio Hondo International circuit in Termas de Rio Hondo, on April 19, 2015. #

A herd of tule elk leap over a fence in Point Reyes National Seashore, California. The herd moved warily along a California coastal hill as a herd of Black Angus cattle graze nearby. Despite the apparent peaceful coexistence, the animals are at the center of a battle for precious grasslands reduced by the state's drought. Ranchers and farmers who live and work within Point Reyes National Seashore want the free-roaming elk fenced in so their livestock do not have to compete for grass. Wildlife advocates and many park users are opposed after almost half of the majestic elks died while living in a fenced-in area in the northern part of the park. #

People walk past a statue of Soviet Union founder Vladimir Lenin during celebration of his 145th birthday at the Lenin Hut Museum at Razliv lake, outside St.Petersburg, Russia, on April 22, 2015. #

People fly their kites to form the shape of a car in the sky on the beach in Berck, northern France, on April 20, 2015, during the 29th "Rencontres Internationales de Cerfs Volants" (International Kite Meeting) which runs from April 18 to 26. #

In this photo taken on Friday, April 17, 2015, the sky over Sanaa, Yemen, is illuminated by anti-aircraft fire during a Saudi-led airstrike. Iran's foreign minister urged U.N. Secretary-General Ban Ki-moon on Friday to try to end "the senseless aerial attacks" in Yemen by a Saudi-led coalition and establish a cease-fire. #

A woman poses next to a work by Brazilian artist Nilo Zack during the 3th International Biennial Fine Art Graffiti exhibition at the Ibirapuera park in Sao Paulo on April 21, 2015. #

An orca whale lands on the beach, trying to catch a baby sea lion along the shore of Punta Norte, near the Patagonian village of Puerto Piramides, on April 21, 2015. The orcas hunt in this manner during this time of the year when baby sea lions are learning to swim. #

Partially demolished buildings at a demolition site making way for a new residential area, in Hefei, Anhui province, China, on March 13, 2015. More than a dozen families in the area have been living in these partially demolished buildings, or nail houses, surrounding by ruins for more than two years as they did not reach agreements with developers regarding their compensations, local media reported. #

Members of the Oath Keepers provide security at the Sugar Pine Mine outside Grants Pass, Oregon, on April 22, 2015. The owners of the Oregon gold mine who called in armed activists the Oath Keepers to protect their claim amid a bitter land use dispute with the U.S. government have appealed a federal stop-work order, U.S. officials said. #

Jesus Rivera of Kennah Construction works on a swimming pool demolition for a homeowner who is going to replace the pool with a drought resistant garden, in Lakewood, California, on April 21, 2015. With the country's most populous state entering the fourth year of a devastating drought, Governor Jerry Brown has ordered an overall 25 percent cut in urban water use though the first statewide mandatory reductions in California's history. The suppliers with the highest per capita water use would have to accept a 36 percent cut. Meanwhile, environmentalists and some urban dwellers say the state's $45 billion agriculture industry should bear a greater share of water savings, given its massive water use. #

North Korean leader Kim Jong Un views the dawn from the summit of Mt Paektu on April 18, 2015, in this photo released by North Korea's Korean Central News Agency (KCNA) on April 19, 2015. #

Members of the Barrio 18 gang wait to be admitted on their arrival to the San Francisco Gotera penitentiary on April 21, 2015. The Salvadoran government transferred 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in an effort to curb gang violence, according to local media. #

Desktops decorated with graffiti by former pupils are displayed at Rugby School in central England. Rugby School is known as the spiritual home of rugby. According to a popular version of the game's origins, it was on the school's playing field that in 1823, in a game that could loosely be described as football but was more like a brawl, a pupil called William Webb Ellis caught the ball and, instead of kicking towards the goal, sprinted with it - breaking the code and laying the way for modern-day rugby. #

Windows of various apartments of a high-rise residential building are seen in the western suburb of Mumbai, India, on February 8, 2014. The cost for buying a 269 square feet (25 square meters) one-bedroom apartment in this building is around 9,293 Indian rupees ($150) per square feet or 2,500,000 Indian rupees ($40,000). The rent for an apartment in the same building is around 10,000 Indian rupees ($160) per month. #

Iranian navy troops march in a parade marking National Army Day in front of the mausoleum of the late revolutionary founder Ayatollah Khomeini, just outside Tehran, Iran, on April 18, 2015. #

A humanoid robot named Han developed by Hanson Robotics reacts as the controller commands it via a mobile phone to make a facial expression during the Global Sources spring electronics show in Hong Kong on April 18, 2015. According to Hanson Robotics the robot's skin is made out of a material called Frubber, an elastic polymer that mimics the human skin, and installed with about 40 motors on its face which help create various expressions. Han can answer simple questions and staff said it can be used in the field of customer service. #

Spanish matador David Galvan is tackled by a bull during a bullfight at The Maestranza bullring in the Andalusian capital of Seville, southern Spain, on April 24, 2015. #

A man rescues a migrant from the Aegean sea, in the eastern island of Rhodes, on April 20, 2015. Greek authorities said that at least three people died, including a child, after a wooden boat carrying tens of migrants ran aground off the island of Rhodes. #

Armed Forces of Malta soldiers carry a coffin with the body of a teenage migrant to an inter-faith burial service at Mater Dei Hospital in Tal-Qroqq, outside Valletta, on April 23, 2015. Public outrage over the deaths peaked this week after up to 900 migrants died last Sunday when their boat sank on its way to Europe from Libya. #

View of the Calbuco volcano from Puerto Varas, Chile on April 24, 2015. A large column of smoke streamed from Chile's Calbuco volcano Friday, prompting new warnings that it could erupt again after unexpectedly roaring back to life and forcing thousands to evacuate. #

Actresses dressed as ancient handmaidens dance at a commemorative parade marking the 2,768th anniversary of the founding of Rome on April 19, 2015 in Rome, Italy. The birth of Rome is celebrated in the capital annually, with actors dressed as denizens of ancient Rome taking part in parades and re-enactments of the ancient Roman Empire. #

An elderly protester yells as she is blocked by a barricade of policemen while marching down the street during a rally in central Seoul, South Korea, on April 24, 2015. About 260,000 workers took part in a nationwide one-day strike, including about 60,000 government employees and 10,000 teachers, according to the Korean Federation of Trade Unions. They protested against the government's push to cut pensions and ease rules for firing employees, according to local media. #