Weaver Ants Stitch Leaves With Living Thread
High in tropical trees, weaver ants live in nests made of leaves, and although they have no tools and cannot sew, they have found a way to stitch leaves together using their own young.
First, a group of workers finds two leaves that are close together. Some ants grip the edge of one leaf and pull. If the gap is too wide, ants form a living chain. One ant holds the edge of the leaf, and the next ant holds on to her waist, and so on, until the leaves come together.
Then comes the clever part. Weaver ant larvae can make silk, although the adults cannot, so a worker picks up a larva in her jaws and carries it along the seam. She taps the larva's head against one leaf and then the other, and each time a thin thread of silk is left behind. Back and forth the worker goes until the silk holds the leaves together.
When many leaves are joined, they form a roomy nest the size of a ball. A tree may hold many nests, and the colony lives in all of them. The ants also defend the tree against other insects.
It is an unusual team. The workers have the strength, and the larvae have the glue.