Nature

American Spring Live: Migration

Breeding and the greening of the landscape are tied to another major spectacle of spring: the mass movements of animals as they take advantage of spring's bounty. Meet the scientists who track these journeys, often over vast distances, from winter refuge to spring nesting grounds. As they attempt to uncover the precise triggers and timing of migration and its impact on other animal species, the scientists grapple with how these patterns and behaviors may shift due to climate change.