The stimulus that initiates a particular behaviour may be external or internal . Back to choose another topic Innate and learned behaviour. There are several different methods of learning. However, if an animal does not have the necessary physiological and anatomical features to carry out a particular behaviour, then no amount of learning will make it possible. Back to choose another topic Structure and function in determining behaviour.
Physiology is essentially the internal stimulus that triggers a number of behavioural responses.
For example, temperature and pain receptors may initiate a particular response, low blood nutrient concentrations might initiate a different response and elevated blood sex hormone concentrations would be expected to trigger another entirely different response. Structures have evolved along with behaviours that make the most of the activities the structures permit. If a structure ceases to be of use to a species, it is sometimes, but not always, lost over many generations. The genetic information for a structure that confers a survival advantage is unlikely to be lost in a species . Back to choose another topic Solitary or group behaviours in relation to the animal's habitat.