Physical well-being is manifested by a state of clinical health. Behavioral well-being is manifested by behavior considered to be normal for that species and strain, together with the absence of significantly abnormal behavior. In the interest of well-being, a social environment is desired for each animal which will allow basic social contacts and positive social relationships.
Social behavior assists animals to cope with circumstances of confinement.
Caging, whether for single animals, pairs, or groups, should be enriched appropriately for the species. It is necessary to recognize affiliations which commonly occur within and between species. Chronic isolation as a method of accommodation, should not normally occur. However, in exceptional circumstances, and with clear scientific and biological justification, some animals may be better kept alone. Positive interactions with human beings are important in some species, and particularly in conditions of social isolation.