Nature
Weaver ants glue leaves together using their own larvae as glue guns
To build a nest, weaver ants pull leaf edges together with their bodies, then carry their own silk-spinning larvae back and forth along the seam like living glue guns. The larvae secrete silk on command, and the workers use it to stitch the leaves into a sealed, waterproof pouch. The larvae themselves never get to spin a cocoon of their own.