Plural of caddisfly; aquatic insects whose larvae build protective cases from sand, pebbles, or plant material before becoming winged adults.
From 'caddis' (of uncertain origin) plus 'flies.' The compound term emerged as naturalists studied these insects in freshwater environments.
Caddisfly larvae are like tiny architects—some species build spiral cases like snails, others use leaves, and scientists use their presence to measure water quality!
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