In the Northern Rockies, quality aquatic habitat for native fish and wildlife can be summed up in four words Cold, Clean, Complex, and Connected. The DVD explores these attributes in depth. This page is an explanation of complex habitats—the importance of having a natural mix of pools, riffles, runs, and glides, quiet water, spring-fed channels, beaver ponds, and groundwater upwellings. The section stresses the importance of each kind of habitat, that each provides something native trout and insects need, that each is part of a healthy stream.