Feline Social Behaviour

Key Points
Cats are a discretionary social species; social groups are formed under certain circumstances, but this is not essential to the survival of the individual. The functional basis for the formation of social groups is kitten rearing by groups of related females. Groups form when resources are abundant, and break up when they dwindle.

Introduction

Cats have often been mistakenly characterised as solitary animals as a result of their depiction in popular literature, and this false perception has persisted in the popular imagination. Whilst they do use distance-maintaining behaviour to avoid direct conflict with each other, the importance of social interaction in this species is clear from the presence of specific distance decreasing and affiliative behaviours.

Natural social groups are made of related female cats, kittens and juveniles. If resources are insufficient to comfortably maintain a group, surplus females will leave or be displaced from the group as they reach maturity and become direct competition for resources with established group members. As they approach reproductive maturity, males leave the group and secure their own, much larger, territories, visiting different groups of females to mate.

Group Size

Tolerance of group size varies considerably within Felis silvestris, with some subspecies such as the Scottish wildcat (Felis silvestris grampia) being almost completely solitary, and others such as the African/Near Eastern wildcat (Felis silvestris lybica) being more sociable and living in groups. This may reflect climate differences in the locations where these subspecies evolved; in temperate and cold climates where human population density is also low, sources of food and shelter may be more sparse and subject to greater competition. Genetic studies indicate that the domestic cat is descended from Felis silvestris lybica, which would suggest a higher level of sociability in the domestic cat compared with UK-native wild cats.

Observational studies by authors such as Leyhausen, Laundre (1977) and Fagen (1978) expanded knowledge of the social communication and organisation of cats, and revealed their capacity for group living. The work of authors such as Dards (1978, 1981, 1983), who studied dockyard cats in the UK, and Denny et al. (2002) have identified a now well recognised functional template for domestic cat organisation in which related female cats form social groups along with their offspring and juvenile cats. The purpose of the groups is to aid in successful kitten rearing. Males are loosely associated with these groups of females and roam a much larger territory that encompasses the home ranges of several groups of females.

Groups of females form in areas where food and shelter resources are abundant, but group members still continue to act independently of one another. Unlike some species in which females are hostile to the offspring of conspecifics, nursing queens seem to show little discrimination when caregiving to kittens; they will feed and groom any kitten that approaches them. This adaptation provides the basis for the formation of female social groups, as it enables kittens to be protected and cared for by members of the group whilst others are hunting. Even so, the only sharing of food between cats is between mothers and their kittens; meals are not shared between adult females.

Until they are completely weaned and able to catch and kill their own prey, kittens are not a source of competition for resources with adult cats, because their nutritional requirements are met by the mother. Once young cats become fully independent, they do become potential competitors for food and shelter resources. If these are not sufficiently abundant then females may leave the group.

Whilst there are situations in which resources naturally occur in high density, human settlements appear to be a significant driving force behind the formation of more permanent feline groups. Where people are absent, and locations of high resource density are therefore absent, cats favour a solitary lifestyle other than when they are raising kittens.

Social Behaviour

Aggression is seen between adult females that are not members of the same social group, as there is competition between groups for access to food and shelter. The maintenance of territorial boundaries limits contact between members of different groups. However, juvenile cats are more receptive to social contact with unfamiliar individuals, which may favour the formation of new groups by young adult cats.

When cats rub against each other and groom each other they transfer scent to create a common group odour. In wild or feral cat groups, individuals may already share strong odour similarities since in most cases groups are composed of related females. Allorubbing and allogrooming of this kind are essential to social bonding but do not contribute to self-maintenance; cats can groom themselves successfully without assistance from others.

Male cats generally do not tolerate contact with each other, and will compete strongly for control over access to an area that encompasses the home ranges of groups, or individual, female cats. However, some authors report that well-matched males sharing a neighbourhood will occasionally stop fighting and form loose social relationships that are termed “brotherhoods”.

Neutering alters the social behaviour of male cats, reducing their territory size and the level of inter-male conflict. This is observed in large suburban cat colonies in which neutered males participate equally with females.

Social Structure in a Domestic Setting

In a domestic context, groups are formed by the successive introduction of unrelated individuals by the owner. There is no function for the group, and there may be a mix of breeds, age, sex and personality traits (such as sociability). New cats may be introduced when the resident cats are in middle age; a time when their sociability may be reduced. This creates an artificial social setting in which individuals that would, in a wild or feral context, be unlikely to form a social group, are brought together. In a domestic setting, conflict and tension become increasingly likely as group size increases, or resources need to be shared. Lacking a functional social structure that incorporates all individuals, with domestic cat groups characteristic individual group and individual behaviour can become apparent:

Cliques or Factions: Groups or 3 or more cats that show greeting and other affiliative behaviour towards each other, but may be aggressive to other members of the domestic group.

Pairs: Pairs of cats, often litter mates or cats that were homed together when very young, that greet and show affiliative behaviour towards each other.

Social Facilitators: These cats will often offer and receive greetings and affiliative behaviour with cats from several factions or cliques. They may also associate with other cats outside the group and serve to maintain group odour between individuals and sub-groups that rarely interact directly with each other.

Satellite Individuals: These offer and receive little or no greeting or affiliative behaviour with the other cats in the home. They may be involved in minor or passive aggressive incidents with other cats in the group, often as the recipient of threat.

Despots: These individuals may deliberately monopolise resources and create opportunities to intimidate other cats in, and outside the home.

Multi-Cat Households

Like their wild ancestors, domestic cats have the capacity to form social groups, but they do not need to do so. There is no evidence that singly housed cats experience stress related health or behavioural problems. However, stress related behaviour problems such as indoor spray marking are more likely in multi-cat households. Greater levels of conflict are observed in multi-cat households, which is identified as an underlying factor in stress related health problems such as feline idiopathic cystitis , which may also be more common in multi-cat households.

Given the increased probability of inter-cat tension in multi cat households, and the very high cat population density in some urban areas, owners should be encouraged to exercise caution when considering the introduction of additional cats to a household. Although some cats do form strong social bonds with each other, these relationships are not the norm and are not something that cat owners should expect to see. Singly housed cats with a suitably enriched environment have no intrinsic need for the companionship of another cat; the default state of cast is as solitary hunters that do not need to associate with other cats in order to survive. It is more important that owners focus on providing cats with sufficient safe territory, food, shelter, and opportunities to play and exercise.

If a new cat is to be added to a household where there are already resident cats, then the new cat must be introduced very carefully. Apart from introducing the new cat correctly, it is important to make sure that the resident cats have a surplus of the resources they need so that they feel comfortable to coexist without competition.

Suitable Multi-Cat Household Cats

Sociability in cats may reduce after the age of 2 years, and be significantly reduced in middle age. It may therefore be more difficult to mix cats that are 2 years of age or older. There is also significant individual variation in the sociability of cats. Cats are more likely to integrate in a multi-cat household if they have previous successful experience of living in a similar multi-cat setting. Although there is some evidence that certain sex pairings may be more likely to succeed (for example, a resident cat may be more accepting of a new cat of the opposite sex), individual variation in social tolerance is more important.

Owners who seek to have more than one cat may be best advised to start with two kittens of the same sex, as differences in behavioural development between male and female kittens can lead to problems.

Replacing a Housemate

Friendships between cats are unique and individual and they cannot be replaced by bringing in a new cat. If a pair of littermates has been raised together, their bond may be particularly strong. The remaining cat may show signs of grief, searching for and calling out for the missing one. This can go on for several months, and is a particularly bad time to introduce another cat as any new cat may be met with intense hostility. It is important for owners to realise that strong bonds between cats cannot be replaced by the introduction of another cat.