Supplementary Movie S3 from Fire ants perpetually rebuild sinking towers PhonekeoSulisay MlotNathan MonaenkovaDaria HuDavid ToveyCraig 2017 A finger of ants peels off the central rod, indicating the importance of ring formation in making stable towers. Rod diameter is 19.5 mm and event is observed 20 minutes after construction began. Video is in real time.