Real or perceived threat in the environment, elicits stress response in animals, which disrupts the internal constant environment of the animal. There are different kinds of stressors that animals can be exposed to, and there are different kinds of stress responses that animals display as a result. Physiological changes that happen because of stress cause behavioural responses in animals. There are different types of behavioural responses: impairment of response inhibition and lack of motivation, changes in social, sexual,