Ducks Unlimited has played an important part in helping to manage the wetlands all over North America. Chuck and Andy find out just how important the wetlands are and what’s being done to preserve them. Dr. G comes up with a fascinating new way to filter dirty water, and explains how the water cycle works. Unfortunately for GP, the mad-ones’ water purification system is less than stellar and they all end up with a belly ache.

Originally released by Distribution360, 2014. Streaming video file encoded with permission for digital streaming by Infobase on June 26, 2015.

Threatened Delta Marsh (3:43); --Broughton's Creek Water Research (4:12); -- Removing Oil With Soap (2:42); -- Urban Wetlands (2:47); -- Ruffed Lemur (2:57); -- Oak Hammock Marsh (3:34); -- Credits: Duck!: Planet Echo Season 4 (1:00); .