Ingo Arndt / Caddisfly (Limnephilidae) case built out of sticks and bark fragments, Germany, November.

Ingo Arndt / Caddisfly (Limnephilus sp.) case built of sticks, wood fragments, seeds, snail shells and plant stems, Germany, November.

Jan Hamrsky / Case-building caddisfly larva (Trichoptera), Europe, June. Controlled conditions.

MYN / Tim Hunt / Composite of Caddisfly (Trichoptera) larva and cases, Worcestershire, England, UK, May.

Stephen Dalton / Caddisfly (Trichoptera) larva with a carapace it has constructed from bits of vegetation. Sussex, UK, March.

Nick Upton / Caddis fly (Trichoptera) resting on riverbank vegetation, Wiltshire, UK, May.

Magnus Lundgren / Wild Wonders of China / Gigantic caddyfly larva in casing of leaves, Tangjiahe National Nature Reserve, Sichuan Province, China

Magnus Lundgren / Wild Wonders of China / Gigantic caddyfly larva builing casing of leaves, Tangjiahe National Nature Reserve, Sichuan Province, China

Jan Hamrsky / Case-building caddisfly larva (Limnephilus rhombicus), Europe, June, controlled conditions

Jan Hamrsky / Case-building caddisfly larva (Limnephilus rhombicus), Europe, June, controlled conditions

Jan Hamrsky / Case-building caddisfly larva (Limnephilus rhombicus), Europe, June, controlled conditions

Jan Hamrsky / Case-building caddisfly larva (Limnephilus rhombicus), Europe, June, controlled conditions