They are intelligent, and they have the ability to secrete a chemical through their bite that allows them to exert control over a person.

Paper wasps secrete a chemical which repels ants, which they spread around the base of the anchor to prevent the loss of eggs or brood.

Some scientists believe they travel through microscopic fissures in ice sheets, while others believe they secrete some chemical which can melt ice by lowering its freezing point, like an antifreeze.

The injured ants all secreted a chemical pheromone scent that compelled other soldiers to come to their aid.

It was later discovered that the larvae secreted a chemical called allantoin, which had a curative effect.

She concluded that the tissues of the limb must secrete a substance which was necessary for the survival and growth of the nerve cells.

Mast cells secrete a substance known as histamine, which produces inflammation.

He may secrete a substance through his skin that protects them from infection.

The theory states that each leaf on a stem secretes a substance that inhibits growth of a new leaf.

Scientists first observed interferon in the 1950s, and when they learned that human cells secreted the substance it was postulated that interferon could hold the key to beneficial antiviral properties.