Richard Menary (Ed.), The Extended Mind, Cambridge (MA), The MIT Press Bradford Book, 2010, p. 14.

Similarly, the caddis fly larva collects small stones and shell fragments from the riverbed and binds them together with a kind of secreted cement (Dawkins 1982). The caddis fly larva then lives in and carries this new home around with it on the  river-bed for its larval period. Humans with their linguistic surround, speech and writing, are in a simular situation. They must create and maintin delicate and intricate linguistic webs as part of their cognitive processing.