The Sand Lancet’s Strategy
In The Sand Lancet’s Strategy, narrator Sir David Attenborough looks at how living in an area with high and low tide impacts animals, like the sand lancet that lives in sandy areas, compared with those that live in rocky areas, like the mussel or barnacle. This video is excerpted from BBC’s Blue Planet, a definitive documentary series diving into the mysterious depths of the sea to discover the natural history of the world’s oceans and the rarely seen marine life that reside there.
Lesson Express
Q: Where are the sand lancets headed when they leave their burrows in the sand?
A: The sand lancets are hungry and swim together to find plankton in shallow, open water.
Q: What do the sand lancets do if they swim too far offshore into deeper water?
A: If the sand lancets swim too far out of their depth, they form a tight school to protect themselves against predators.
Q: What happens to the mussels and barnacles when the sea recedes?
A: On the rocky shore, the mussels and barnacles are exposed to the Sun. Since they can’t dig underground, they cook in their own shells.
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