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View of the metal fence along the border in Sonoyta, Sonora state, northern Mexico, between the Altar desert in Mexico and the Arizona desert in the United States, on March 27, 2017.
Threatened species like the Sonoran pronghorn or desert bighorn sheep freely cross the border between Mexico and the United States in protected biospheres, but the construction of US President Donald Trump's wall will block their movement in these desert valleys and could drive them to extinction. / AFP PHOTO / PEDRO PARDO        (Photo credit should read PEDRO PARDO/AFP/Getty Images)
View of the metal fence along the border in Sonoyta, Sonora state, northern Mexico, between the Altar desert in Mexico and the Arizona desert in the United States, on March 27, 2017.
Threatened species like the Sonoran pronghorn or desert bighorn sheep freely cross the border between Mexico and the United States in protected biospheres, but the construction of US President Donald Trump's wall will block their movement in these desert valleys and could drive them to extinction. / AFP PHOTO / PEDRO PARDO        (Photo credit should read PEDRO PARDO/AFP/Getty Images)

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CNN's Leyla Santiago visits Mexico's southern border, where there is an uptick of Central American immigrants streaming into the country and hiring smugglers in hopes of reaching the US.

More immigrants desperate to cross Mexico border

CNN's Leyla Santiago visits Mexico's southern border, where there is an uptick of Central American immigrants streaming into the country and hiring smugglers in hopes of reaching the US.