The Fascinating Animals That Inhabit Mountain Streams
In The Fascinating Animals That Inhabit Mountain Streams, narrator Sir David Attenborough investigates the unusual adaptations of animals that inhabit the rushing waters of mountain streams. 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 water conditions in the upper reaches of mountain streams.
A: Full of energy, powerful rapids, cold, low in nutrients, high in oxygen, few creatures living there.
Q: What factors create these water conditions?
A: Student responses will vary. Students may mention that steep slopes give the rushing water its energy or that being so close to the source means fewer nutrients have accumulated.
Q: What adaptations allow animals to survive in upper mountain streams?
A: Flattened bodies reduce drag, bushy gills take in oxygen from the current, hooks and silk safety line to anchor themselves, and fan-like forearms trap particles.