To protect themselves from predators, the Baya Weaver birds build their nests in Acacia trees and thorny palms. While the weavers are often found in colonies, the occasional lone nests do exist.
Native to Central Africa and South-East Asia, the Weaver Ants use live leaves bound by silk they produce to make their nests. While smaller nests are made of a single leaf, some nests can reach sizes of half a meter, comprised of many leaves.
The European Red Wood Ants build their anthills in huge mounds on forest floors. The colony will often build several mounds, interconnected with the main hill, and would move to the adjacent mounds if the main one is damaged beyond repair.
When the Caddisfly larva reaches its time to pupate, it weaves a cocoon out of sand, shells, and pebbles, with silk it produces, providing itself with a safe, armored place in which to mature.
These huge wedges are the nests of the Compass Termite. The wedges are generally north-south oriented, which gave these insects their unusual name. It is believed that their mounds are built that way to regulate the temperature of the underground nests.
Most wasps actually don’t build nests (preferring solitary life or as parasites), but social wasps build paper nests by mixing plant pulp with their saliva.
Beavers are famous for building dams. These wood and grass structures are built to flood a certain area with water, while the beavers use the underwater entrance to the damn in order to avoid predators and make fishing easier. The largest known damn is nearly a kilometer (3000 feet) long and is located in Canada’s Wood Buffalo National Park.