The Arrival of Spring in Shallow Polar Seas
In The Arrival of Spring in Shallow Polar Seas, narrator Sir David Attenborough describes how shallow polar seas undergo an incredible transformation. Ice gives way to abundant fish and krill, which draws humpback whales and shearwater birds from thousands of miles away. This video is excerpted from BBC's Planet Earth, a breathtaking documentary series that highlights the natural wonders of our planet.
Lesson Express
Q: Describe the polar seas in spring.
A: Ice starts to melt; the Sun shines; rough weather and strong currents stir up the water; whales and birds migrate to feast on fish and krill.
Q: What adaptations do you notice about the animals in the video?
A: Birds and whales migrate to adjust to the season; whales store fat to survive the winter; shearwaters can dive up to 130 feet m to find food.
Q: What might be causing fish and krill stocks to decline rapidly?
A: Student responses will vary. Students may mention pollution or overfishing.
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