As ants forage, or search for food, they leave one type of pheromone behind them, which they can use to find their way back to the colony. When they find food, they follow the trail back to the colony while leaving a trail of a different pheromone.

When another foraging ant finds a trail leading to food, they can follow it to find the food and take it back to the colony, while leaving their own pheromone trail. As more and more ants come across the pheromones, they make it stronger and an ant trail is formed.

An ant scent trail is invisible to humans. The easiest way to see a scent trail is to watch the ants traveling in a line. Very rarely will a few ants break off from the line to scout new food sources. Early on in an invasion, the…

Source by Ma. Theresa Galan