This is absolutely amazing. I always thought ants were clever, even as a kid. This just goes to prove what an understatement that was.
http://www.myamazingearth.com/2012/10/giant-ant-colony-excavated-you-wont-believe-what-they-build-underground/ (http://www.myamazingearth.com/2012/10/giant-ant-colony-excavated-you-wont-believe-what-they-build-underground/)