Caddisflies: River Engineers
In Caddisflies: River Engineers, Ranger Hamza and the Ramblers visit a river. They watch the sediment flow by and learn how caddisflies can be eco-engineers and help remove sediment from the river, keeping it clean. This video is excerpted from BBC's Ranger Hamza’s Eco Quest, a nature exploration show in which Ranger Hamza and the Ramblers go on quests to discover nature’s wonders and the important role they play in our environment.
Lesson Express
Q: Why is sediment important for caddisflies?
A: They make their casings from bits of sediment.
Q: How are caddisflies eco-engineers?
A: They use sediment for their casings and keep the river healthy by preventing sediment from building up.
Q: What do you think happens when there is too much sediment in the river?
A: Students may talk about how the sediment can catch and trap animals. They may talk about how too much sediment could cover and kill animals or plants on the bottom of the river.
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