Aggression is defined for these purposes by "intent to harm".

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Causes of Aggression

• Frustration

• Direct provocation

• Physical or psychological pain

• High temperature can elicit aggressive behavior in animals and people

• Crowded environment 

• Chemical imbalances in the brain

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Types of Aggression

1. Fear Aggression

2. Territorial Aggression

3. Idiopathic Aggression

4. Predatory Aggression

5. Intra-Household Aggression

6. Control Aggression

7. Resource Guarding/Possession Aggression