The Great Salmon Migration
In The Great Salmon Migration, narrator Sir David Attenborough explains that in the world's largest fresh-water fish migration, salmon migrate upstream to where there are fewer predators to eat their eggs. Grizzly bears, however, threaten the fish. This video is excerpted from BBC's Planet Earth, a breathtaking documentary series that highlights the natural wonders of our planet.
Lesson Express
Q: Why do salmon travel so far to release their eggs?
A: There are fewer predators to eat their eggs.
Q: What can you infer about the waters in which salmon live?
A: The ocean is salt water, while rivers are fresh water; salmon are specially equipped to adjust to this change.
Q: If you were a salmon, how would you avoid the grizzly bear?
A: Student responses will vary. Students may suggest sticking to deep water.
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