These states vary in climate and cover ... Madison who studies net migration patterns going back decades. “Migration is always happening, especially in the United States,” she says.

Unlike international migration, domestic climate-induced migration involves people relocating within the United States in search of improved quality of life in the face of escalating climate disasters ...

While they're tiny - they weigh less than a nickel – they make a huge annual migration every year, from the United States in the summer ... reported sightings to map their progress.