In 1966, Heinz Sielmann sets off on his longest expedition. He spent 19 months traveling through the wilderness of North America. From the alligator swamps of the Everglades to the breeding grounds of arctic waterfowl.
| Actor | Role |
|---|---|
 Heinz SielmannSelf | Self |
| EErnst ZeitterNarrator (voice) | Narrator (voice) |