On a daily basis, hundreds of migrants from Central America and Mexico attempt to cross the border into the US. Photographer Alfredo Estrella captured their life at the border. /CFP Photo

A Honduran migrant warms his hands on an improvised campfire near the railtracks in Caborca municipality, Sonora state, Mexico. /CFP Photo

A border post between Mexico and the US in Sasabe in Sonora state, Mexico. /CFP Photo

Migrants chat on the train tracks in Caborca in Sonora state, Mexico. /CFP Photo

Migrants eat food donated by the Community Center for Migrant Assistance in the community of Caborca in Sonora state, Mexico. /CFP Photo