A large piece of cereal which, if broken down, would have
required 498 solitary ants was carried collectively by just 14
ants.
The weight that can be carried by N workers is proportional
to N2.044.
Increased efficiency seems to come from the group's ability
to overcome rotational forces.
An ant will first try solitary transport. If the object
cannot be lifted the ant will try to drag it. If it will not
budge then the ant tries at a different position. After some
time the ant gives up and starts recruiting helpers.