Small shelters underwater

The larvae of the friganiums, or tricopters, live in the water; many build shelters with sand or vegetable fragments. They integrate the food chains of rivers and streams, serving as food for fish, birds and amphibians. Tagis' guide highlights its usefulness as ecological indicators. Finding a copy, however, does not alone certify the quality of the water.

The underwater shelter is only a part of the story. The adult has hair-covered wings, thin antennas and when he lands, he has wings like a small roof over the body. He may remember a butterfly, but these have scales on the wings. The adult friganiums usually fly at nightfall and live near fresh water masses.

Nor does there exist a single menu for all larvae: according to the group, they can consume algae, plants, organic remains or other invertebrates. They are consumers and, at the same time, food from other animals. A food network better describes these relationships than a row with only one food for each species.