Add a bit more of those characteristics, plus lack of remorse and physical aggression, and you have someone who ends up behind bars.

There are many other methods of discipline (such as time out or grounding) that do not involve physical aggression.

It found that 48 per cent of primary teachers encountered physical aggression, compared with 20 per cent of teachers in secondaries.

The present analyses indicate that men are among those who are likely to be on the receiving end of acts of physical aggression.

Females will typically employ scent-marking intruder response tactics, whereas males are more prone to vocalizing threats, physical aggression, and piloerection.