Each fall in North America, the salmon run sees huge numbers of fish return from the sea to spawn in freshwater. Making their way upstream, they follow the imprinted scent of their birthplace. Along the way are numerous obstacles – including grizzly bears. As the forest giants prepare to hibernate, they eat tons of salmon. The nitrogen-rich leftovers feed smaller mammals but also, amazingly, trees. We examine the fragile balance of this unique relationship.
Add to playlist
