I found this interesting article on the BBC website about how ants work together for the common good of the colony. Apparently when out foraging ants use their own bodies to plug holes so that their fellow workers can walk across them. They even go as far as to choose which ant is the best size to fit the hole so they can plug it more effectively. The ants can stay in place for hours at a time, staying motionless until all the other ants have crossed the hole. Basically these techniques allow the ants to create faster ways of bringing their food back thus benefiting the whole colony. How cool is that.
