In this October 22, 2014 file photo, demonstrators protest the disappearance of 43 students from the Isidro Burgos rural teachers college, in Mexico City. Tens of thousands marched in Mexico City's main avenue demanding the return of the missing students who were rounded up by local police in Iguala, a town in southern Mexico, and handed over to gunmen from a drug cartel September 26. (Photo by Marco Ugarte/AP Photo)

In this November 20, 2014 file photo, protestors face off against federal police over barriers surrounding the National Palace in Mexico City. Protesters marched in the capital city to demand authorities find 43 missing college students, seeking to pressure the government. Mexico officially lists more than 20,000 people as having gone missing since the start of the country's drug war in 2006, and the search for the missing students has turned up other, unrelated mass graves. (Photo by Rebecca Blackwell/AP Photo)

In this September 25, 2014 file photo, containers hold genetically modified aedes aegypti mosquitoes before being released in Panama City. They are bing released to combat and control populations of mosquitoes that transmit dengue. The aedes aegypti mosquito is the main vector for another viral disease called chikungunya that appeared less than a year ago in the Americas and is raging across the region, leaping from the Caribbean to the Central and South American mainland, bringing the total number infected in the epidemic to more than 1 million. (Photo by Arnulfo Franco/AP Photo)

In this August 26, 2014 file photo, 4-year-old patient Saul Valverde kisses Andariego, a 19-year-old veteran horse that retired from “charreria”, the Mexican version of a rodeo, at a corral in southern Mexico City. Andariego now works as a therapy horse, helping children with special needs. In Mexico, the career of the charro horse usually runs about 10 to 12 years. (Photo by Marco Ugarte/AP Photo)

In this July 17, 2014 file photo, boys watch television in their room at The Great Family group home in Zamora, Mexico. After a police raid on the refuse-strewn group home, residents of the shelter told authorities that some employees beat residents, fed them rotting food or locked them in a tiny “punishment” room. Shelter residents were still being kept at the home while officials look for places to transfer them. (Photo by Rebecca Blackwell/AP Photo)

In this August 29, 2014 file photo, young miner Leber Vivas Gonzales, 16, center right, walks with his his arm over the shoulders of a rescue worker after he was saved from the El Comal gold and silver mine in Bonanza, Nicaragua. Rescuers saved 22 of at least 26 workers trapped after a mine collapse. (Photo by Esteban Felix/AP Photo)

In this January 31, 2014 file photo, the body of boxer Christopher Rivera, who was shot to death, is propped up in a fake boxing ring during his wake held in the public housing project where he lived in San Juan, Puerto Rico. Elsie Rodriguez, vice president of the Marin funeral home, explained that Rivera had asked his family that if he died, he wanted his funeral to make reference to his boxing career. (Photo by Ricardo Arduengo/AP Photo)

In this April 28, 2014 file photo, a woman throws a rock and a bag at police blocking her from getting home in the Huepetuhe district of the Madre de Dios region of Peru. Security forces began destroying illegal gold mining machinery in Peru's southeastern jungle region of Madre de Dios, as authorities began enforcing a ban on illegal mining. (Photo by Rodrigo Abd/AP Photo)

In this October 10, 2014 file photo, a woman carries a bag on her back as she walks past slogans in support of President Evo Morales painted on a wall in La Paz, Bolivia. Morales went on to win re-election under the Movement Toward Socialism Party (MAS). (Photo by Juan Karita/AP Photo)

In this March 20, 2014 file photo, resident cat, “El dueño de casa”, tears through a government palace corridor as officials await the arrival of U.S. Assistant Secretary of State of the Bureau of Western Hemisphere Affairs Roberta S. Jacobson, for her official meeting with Paraguay's President Horacio Cartes in Asuncion, Paraguay. (Photo by Jorge Saenz/AP Photo)

In his October 15, 2014 file photo, 8-year-old Yodimiler Arias, along with fellow wrestlers, listen to instruction from their teacher, in a park in Old Havana, Cuba. Yodimiler's mother said the U.S. flag motif wrestling suit was sent by her cousin in the United States. (Photo by Ramon Espinosa/AP Photo)

In this September 15, 2014 file photo, people salvage useful remains from homes destroyed by Hurricane Odile in Los Cabos, Mexico. Hundreds of impoverished houses were destroyed in the Unidad Real squatter's settlement and other equally poor neighborhoods. (Photo by Victor R. Caivano/AP Photo)

In this March 25, 2014 file photo, people reach out to receive a bucketful of water as vendors, police and firemen work together to put out a fire at La Terminal, the largest and most important market in Guatemala City. Firefighters struggled to manage the fire that destroyed hundreds of shops due to the lack of water hydrants in the area, located south of the historic city center. (Photo by Moises Castillo/AP Photo)

In this November 12, 2014 file photo, a column of policemen move into a gold mining camp as part of an operation to eradicate illegal mining in the area known as La Pampa, in Peru's Madre de Dios region. Less than a month before Peru played host to global climate talks, the government sent police into southeastern jungles to dismantle illegal gold-mining mining camps. Fifty-thousand hectares of rainforest have been obliterated in the past six years in the wasteland known as La Pampa. (Photo by Rodrigo Abd/AP Photo)

In this May 20, 2014 file photo, a female baby sloth peeks out from behind a door on a floating house in the “Lago do Janauari” near Manaus, Brazil. The sloth was captured by the owner of the floating house, who makes a living showing local fauna to visitors. In an an attempt to prevent any harm to the animals he says he only keeps each animal for a few weeks before returning it to it's natural habitat. (Photo by Felipe Dana/AP Photo)

In this October 31, 2014 file photo, a man dressed as DC Comics super villain The Joker points a toy gun as he strikes a pose in a subway car in Santiago, Chile. (Photo by Luis Hidalgo/AP Photo)

In this September 11, 2014 file photo, a detainee rests, handcuffed to a slide, at a children's playground in a public park in Bogota, Colombia. Authorities have been holding some crime suspects in a public park in western Bogota's La Granja neighborhood because they say there is no more room at a local detention center. Prisoners suspected of crimes ranging from robbery to drug trafficking are kept at a makeshift encampment day and night, guarded by groups of six police officers who switch after eight-hour shifts. (Photo by Fernando Vergara/AP Photo)

In this April 13, 2014 file photo, people watch as a forest fire rages towards urban areas in the city of Valparaiso, Chile. Authorities say the first fire has destroyed at least 150 homes and is forcing evacuations. (Photo by Luis Hidalgo/AP Photo)

In this December 5, 2014 file photo, a youth performs at the inauguration of the new UNASUR headquarters building as Argentina's President Cristina Fernandez, center, UNASUR General secretary Ernesto Samper, second from right, and Suriname's President Desi Bouterse, right, watch in Quito, Ecuador. At left are Paraguay's President Horacio Cartes and Brazil's President Dilma Rousseff. (Photo by Dolores Ochoa/AP Photo)

In this May 2, 2014 file photo, Uruguay's President Jose Mujica flashes a thumbs up as he and and his wife, Sen. Lucia Topolansky, ride away from their home after giving an interview, on the outskirts of Montevideo, Uruguay. (Photo by Matilde Campodonico/AP Photo)

In this March 3, 2014 file photo, Djalma Antonio Jardim, who has a rare inherited skin disease known as xeroderma pigmentosum, or “XP”, looks in a a mirror at his home in the Araras community of Brazil's Goias state. In an effort to camouflage how the disease has eaten away the skin on his lips, nose, cheeks and eyes, Jardim wears a rudimentary orange-tinted mask, its stenciled-in right eyebrow not matching his bushy real one that remains. (Photo by Eraldo Peres/AP Photo)

In this February 22, 2014 file photo, Joaquin “El Chapo” Guzman is escorted to a helicopter in handcuffs by Mexican navy marines at a navy hanger in Mexico City, Mexico. Guzman, the head of Mexico's Sinaloa Cartel, was captured alive overnight in the beach resort town of Mazatlan. (Photo by Eduardo Verdugo/AP Photo)

In this November 15, 2014 file photo, a boy jumps over a whale carcass as workers prepare a grave for the animal's burial on Popoyo Beach in Tola, Nicaragua. The stranded whale was discovered on Nicaragua's southern Pacific coast where a group of people tried in vain to push it back into the sea. (Photo by Esteban Felix/AP Photo)

In this February 5, 2014 file photo, Divaldo Aguiar, who plays the part of Pachencho, lies inside a mock coffin as villagers splash rum into Aguiar's mouth during the Burial of Pachencho celebration at a cemetery in Santiago de Las Vegas, Cuba. The bash kicked off with the slow procession to the local cemetery as pallbearers carried the coffin of “Pachencho”, known the other 364 days of the year as Divaldo Aguiar, to an open grave and used ropes to lower it six feet under. (Photo by Franklin Reyes/AP Photo)