Ecuador - Venezuela Exodus (Harris Whitbeck) 12:33 South America is experiencing its largest mass migration in recent history. Tens of thousands of Venezuelans are fleeing the economic hardship and political instability in their country...arriving at the borders of neighboring countries each day. Peru, Colombia, Argentina and Brazil are all coping with intense pressure from the influx. Correspondent Harris Whitbeck reports from Ecuador, another country feeling the strain of the crisis -- and one... [see more] that's already seen its share of mass migrations.Colombia - Crossing the Darien (Michelle Begue) 13:40 Its not just Venezuela witnessing mass migration these days. Tens of thousands of others across Latin America continue to risk their lives traveling north to the United States. Correspondent Michelle Begue takes us to a city in Colombia called Turbo where migrants from all over the world gather before embarking on a very dangerous journey to cross the Darien Gap.