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 the journeys of animals such as butterflies, birds, bison and bats over vast distances, from winter refuge to spring nesting grounds.
| Creator | Thomas Lovejoy |
|---|---|
| Actor | N/A |
| Country | Germany, United States of America |
| Production | Thirteen |