Immigrants run to jump on a train in Ixtepec, Mexico, during their journey toward the U.S.-Mexico border. President Obama wants nearly $4 billion in emergency funds to deal with the tens of thousands of children from Central America who've been crossing the border. Eduardo Verdugo/AP hide caption

itoggle caption Eduardo Verdugo/AP

Reny Pineda was born in Michoacan, Mexico, but grew up in Los Angeles. In 2010 he returned to his homeland, and joined a vigilante battle against a ruthless cartel ruling the region. Now the Mexican government has ordered the civilian militias to disband, and Pineda picks lemons in this orchard. Alan Ortega /KQED hide caption

itoggle caption Alan Ortega /KQED

Rowan Jacobsen, in the canoe, and Pete McBride and Sam Walton, on stand-up paddleboards, travel through the upper limitrophe of the delta reach (the section marking the U.S.-Mexico border). Before the dam release, Jacobsen described this parched riverbed as a scene of "Mad Max misery." The temporary flow of water helped bolster native habitats that survive here. Courtesy Fred Phillips hide caption

itoggle caption Courtesy Fred Phillips

A migrant from El Salvador holds a map he received from church workers at the Mexico-Guatemala border. It shows the freight train schedules and routes to the U.S. border. Carrie Kahn/NPR hide caption

itoggle caption Carrie Kahn/NPR

Migrants arrive at a rest stop in Ixtepec, Mexico, after a 15-hour ride atop a freight train headed north toward the U.S. border on Aug. 4. Thousands of migrants ride atop the trains, known as La Bestia, or The Beast, during their long and perilous journey through Mexico to the U.S. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

A Mexico City breast-feeding campaigned used posters featuring topless celebrities. At least "La Barbie," a female boxer (shown here), had her boxing gloves on. Via Latin Times hide caption

itoggle caption Via Latin Times

Workers sort through key limes at a packaging house in Apatzingan, Michoacan. More than 90 percent of limes imported into the U.S. come from Mexico. Carrie Kahn/NPR hide caption

itoggle caption Carrie Kahn/NPR

In this June 2013 photo provided by National Geographic, diver Susan Bird, working at the bottom of Hoyo Negro, a large dome-shaped underwater cave in Mexico's Yucatan Peninsula, brushes the Naia skull found at the site. Paul Nicklen/AP hide caption

itoggle caption Paul Nicklen/AP

Joaquin "El Chapo" Guzman is escorted to a helicopter in handcuffs by Mexican navy marines at a navy hanger in Mexico City on Saturday. A senior U.S. law enforcement official said that Guzman, the head of Mexico's Sinaloa Cartel, was captured alive overnight in the beach resort town of Mazatlan. Eduardo Verdugo/AP hide caption

itoggle caption Eduardo Verdugo/AP

The skull of a female Neanderthal, who lived about 50,000 years ago, is displayed at the Natural History Museum in London. Rick Findler/Barcroft Media/Landov hide caption

itoggle caption Rick Findler/Barcroft Media/Landov

A 2010 file photo shows Edgar "El Ponchis" Jimenez Lugo in the city of Cuernavaca, Mexico. The teenage U.S. citizen who acknowledged being a drug-cartel killer has finished his three year juvenile-offender term for homicide, kidnapping and drug and weapons possession. Antonio Sierra/AP hide caption

itoggle caption Antonio Sierra/AP

Rosarito, Mexico, near the U.S. border in the Mexican state of Baja California, is home to thousands of Americans who live there full or part time, many in properties with long-term leases. A proposed change to Mexican law would allow foreigners outright ownership of Mexican beachfront properties. Guillermo Arias/AP hide caption

itoggle caption Guillermo Arias/AP

A nurse treats a cholera patient at the Juan Pablo Pina Hospital in San Cristobal, Dominican Republic, in August. Health officials say that the strain of cholera circulating in the country— the same one that first appeared in Haiti three years ago — has also caused outbreaks in Cuba and now Mexico. Erika Santelices/AFP/Getty Images hide caption

itoggle caption Erika Santelices/AFP/Getty Images