Asked by: Kevin McGrath, by email
Ants don’t have complex emotions such as love, anger, or empathy, but they do approach things they find pleasant and avoid the unpleasant. They can smell with their antennae, and so follow trails, find food and recognise their own colony.
Their exoskeleton has sensory hairs on the outside but they probably cannot feel damage on the inside, which is why parasites can destroy them if they can get in without touching the sensors.
Each ant’s brain is simple, containing about 250,000 neurones, compared with a human’s billions. Yet a colony of ants has a collective brain as large as many mammals’. Some have speculated that a whole colony could have feelings.