Experimenters Bethan, Corey and Rhianna visit Nina in her workshop and see what happens when you build a dam in a stream. Next, they visit a real beaver dam to find out why beavers build them and how they use the pool behind it. Finally, they have a go at building a dam themselves and discover why beavers are such brilliant builders.

Originally released by BBC, 2015. Streaming video file encoded with permission for digital streaming by Infobase on January 17, 2017.

Meet the Neurons (0:55); --Why Do Beavers Build Dams? (2:15); -- Senses Experiment (2:38); -- Why Do Beavers Make a Pool? (3:04); -- Dam Building Experiment (2:56); -- Summary: Why Do Beavers Build Dams? (0:30); -- Credits: Beaver Dams—Nina & the Neurons: Get Building (1:57); .