Silken nets are used to capture food drifting on the current by the filter-feeding larvae (not visible) of the caddisfly. The sides of this net (diameter 8 millimetres) are attached to moss fragments. The larva spends most of its time in its home – a tube-like structure formed from gravel beneath the net. It emerges periodically to check the net for food.
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Photograph by Alex Huryn
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