The March of the Christmas Island Red Crabs
In The March of the Christmas Island Red Crabs, narrator Sir David Attenborough describes how millions of red crabs face an unexpected threat to their annual migration — yellow crazy ants, which were introduced to the island by humans. The ants disrupt the crabs' journey, potentially affecting the island's ecosystem and the crabs' survival. This video is excerpted from BBC’s Planet Earth II, a breathtaking documentary series that highlights the natural wonders of our planet.
Lesson Express
Q: How do yellow crazy ants affect red crabs and other animals on the island?
A: They can stop the crabs from migrating, finding food, or laying eggs, which can make it hard for the crabs to survive.
Q: Why is it important to have many different animals and plants in an ecosystem?
A: Having a variety of animals and plants helps keep the environment healthy and stable.
Q: What are some ways we can stop invasive species like yellow crazy ants from causing harm?
A: We can try removing the ants, bringing in natural predators, or fixing the habitats they’ve damaged.
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