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1

Ethology is the study of animal behaviour in natural settings. Ethological explanations of aggression propose that aggression is INNATE and ADAPTIVE

This is because an undefeated animal is more likely to SURVIVE, and aggressive animals are likely to become DOMINANT in their hierarchy.

2

For example, male chimpanzees use aggression to achieve status at the top of their troop hierarchy

benefits including access to food and female mates

3

Ritualistic aggression

Most intra-species aggression actually involves very little physical fighting and instead consists of ritualised signalling of aggression.

4

These SIGNALS intend to intimate an opponent without actually engaging in physical contact

The opposing rival can then make a decision as to whether to engage in fighting or submit and leave.

5

Ritualistic aggression can also indicate defeat and appeasement.

For example defeated wolves will expose their necks to the victor to indicate its vulnerability to a single bite in the jugular vein.

6

Animals possess innate behaviours called FIXED ACTION PATTERNS (FAP’s) which are produced by

a neural mechanism known as an INNATE RELEASING MECHANISM (IRM) in response to specific ‘sign stimulus’.

7

These ‘signs’ can be what a rival animal looks like

and are usually connected to the internal state of the animal such as its sex drive.

8

Stereotyped

unchanging sequence of aggression

9

universal

same behaviour found in every species model

10

independent of individual experience

behaviour is innate and not learned

11

ballistic

once triggered the FAP behaviour cannot be stopped and is automatic

12

specific triggers

certain sign stimulus activates behaviour

13

supporting evidence for the benefits of ritualistic aggression as it prevents conflicts escalating into dangerous physical aggression
Chagnon
Hoebel

In the Yanomamo people of South America chest pounding and club fighting settles conflicts before more extreme forms of aggression develop
In Inuit Eskimos song duels are used to settle grudges and disputes
rituals have the effect of reducing actual aggression and preventing injury and death, increaing the validity of ethological explanations

14

contradictory evidence suggesting animals engage in killing their own species
Goodall

study on chimpanzees in Tanzania, male chimps from one community set about systematically slaughtering all members of another group. These attacks appeared to be co-ordinated and premeditated, and one example saw a male chimp being held down and systematically hit and bitten during a 20 minute attack. These attacks continued despite signals of appeasement and defencelessness which did not inhibit the aggression
doubt over the claim most animal aggression is ritualistic rather than real, reduces the validity

15

fixed action patterns may not be innate behaviour

Environmental factors such as learning and experience can influence aggressive behaviour patterns in animals. The term ‘fixed action pattern’ has now been replaced with ‘behaviour pattern’ indicating that there are differences within the same species regarding the aggressive behaviour displayed.
reduces the validity, contradicts the idea FAPs are indistinctive and universal