Marine Iguanas in the Galápagos
In Marine Iguanas in the Galápagos, narrator Sir David Attenborough tells how marine iguanas survive on a young, volcanic island in the Galápagos. These unique reptiles have adapted to graze on underwater algae, a critical food source in this challenging environment. 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 have marine iguanas adapted to life on a volcanic island?
A: Marine iguanas have adapted by becoming excellent swimmers, able to graze on underwater algae as their primary food source. Their bodies have also evolved to tolerate the harsh conditions of the island.
Q: How does the volcanic environment influence the iguana’s survival?
A: The volcanic island offers a unique habitat where iguanas can find abundant food underwater, but they also face challenges such as extreme temperatures and the need to navigate rugged terrain.
Q: Why is nutrient cycling important for the survival of species like the marine iguana?
A: Nutrient cycling allows the ecosystem to sustain plant and animal life, ensuring that the iguanas have the algae they need to survive while also supporting other species in the food chain.
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