"Purely noise, to frighten an enemy and express aggression," Helm said.

Women are more likely to instead express aggression through a variety of indirect or nonphysical means.

The species' way of expressing aggression is similar to that of the stoat.

Although females are less likely to initiate physical violence, they can express aggression by using a variety of non-physical means.

Exactly which method women use to express aggression is something that varies from culture to culture.

But studies show that they are less likely to be physically aggressive, and more likely to express aggression indirectly.

I express negativity or aggression in indirect and passive ways.

It may also expose one or both parties, may express aggression as well as affection.

He was a great believer in expressing aggression, not bottling it up.

Typically, very high-pitched calls indicate fear or submission, while loud, lower-pitched calls express aggression.