Man and the Earth
El hombre y la Tierra is a 1974 television series produced by Radio Televisión Española.
61. The Conquest of Water I
0.0Feb 16, 1979 · 28 min
In mountain rivers, crystal-clear and pure rapids, larvae of certain insects such as dragonflies, caddisflies, diving beetles, mayflies, and other species that spend a phase of their life in the water abound, to hunt and feed at the expense of these invertebrates.