RI, MA EHS Pest Control Blog

Ants Remember Their Enemy's Scent

Ant colonies - one of nature's most ancient and efficient societies - are able to form a "collective memory" of their enemies, say scientists.

When one ant fights with an intruder from another colony it retains that enemy's odor, passing it on to the rest of the colony. This enables any of its nest-mates to identify an ant from the offending colony.

The findings are reported in the journal Naturwissenschaften.

For many ant species, chemicals are key to functioning as a society. Insects identify their nest-mates by the specific "chemical signature" that coats the body of every member of that nest.

The insects are also able to sniff out any intruder that might be attempting to invade.

This study, carried out by a team from the University of Melbourne in Australia, set out to discover if ants were able to retain memories of the odors they encounter.

The researchers studied the tropical weaver ant (Oecophylla smaragdina), which builds is home in trees; one nest can contain up to 500,000 workers.

The team set up a "familiarization test" to allow ants from one nest to encounter intruders from another.

Over a series of trials, they placed an ant from a "focal nest" into a tiny observation arena with an ant from another nest.

After 15 of these familiarizing face-offs, the team set up a fake ant invasion. They placed 20 worker ants from the now "familiar" nest on or near the focal nest.

"These intruders were typically attacked by the resident workers," the researchers reported in their paper.

George Williams,
General Manager - Staff Entomologist

Pest Control, RI, Pest Control, MA 

Did you know that an ant's abdomen contains two stomachs?! One stomach holds food for itself while the other one contains food to be shared with other ants.

Here's a few more cool ant facts:

• Ants have 250,000 brain cells while humans have 10,000 million.
• Combined weights of ants on earth is more than the combined weight of humans.
• Ants began farming about 50 million years before humans thought to raise their own crops.
• Ants rarely fight but when they do fight it is a fight to death most of the time.
• Ants often sleep seven hours a day, while a type of ant i.e. fire ant takes about 250 naps each day.
• The legs of the ant are very strong so they can run very quickly. If a man could run as fast for his size as an ant can, he could run as fast as a racehorse.

George Williams,
General Manager - Staff Entomologist

Pest Control, RI, Pest Control, MA