Eleazar Hernández slept on a sidewalk amid a light drizzle, temperatures that dipped close to freezing and the roar of passing trucks. The 23-year-old Venezuelan migrant was trying to make it to the Colombian city of Medellin with his wife, who is seven months pregnant. After months of COVID-19 lockdowns that halted one of the world’s biggest migration movements in recent years, Venezuelans are once again fleeing their nation’s economic and humanitarian crisis.