How Do Ants Find Food?

Step 1 of 5

Nobody is in charge.

The queen lays eggs; she gives no orders. Every ant follows simple local rules, and the colony's cleverness emerges from that.

Step 2 of 5

Scouts wander more or less randomly.

With no information, ants explore in wandering paths. Most find nothing at all — but the colony can afford many failures.

Step 3 of 5

A successful ant lays a trail home.

Having found food, it walks back depositing a chemical. Other ants that stumble on the trail tend to follow it — and lay more as they return.

Step 4 of 5

The shortest route wins automatically.

Ants on a short path complete more round trips in the same time, so they lay scent more often. The short route strengthens fastest.

Step 5 of 5

Evaporation lets them change their minds.

The chemical fades within minutes. When food runs out, the trail disappears on its own and the colony goes back to exploring.

This exact mechanism, copied as an algorithm, is used to route delivery vehicles and network traffic.