What animals built the worlds largest non-human-made structures?

Answer 1

I answered this already as Mountains, which were naturally evolved by upheavals of the earth, volcanism and so forth. they were created, not designed like something animal-made as a beaver dam or natural beehive. Mountains were formed geologically, not as works of animals! where do you get these ideas from?

Answer 2

Some animals that build the world's largest non-human-made structures include termites, which create elaborate termite mounds that can be several meters tall; beavers, which build dams that can be hundreds of meters long; and social wasps, like the Asian giant hornets, which construct large underground nests.