Family break-up in farmed silver foxes (Vulpes vulpes) housed in enlarged cage systems as families

We monitored the behaviour of farmed silver foxes housed in family units in enlarged cage systems from weaning until late October. Activity of family members, use of space available, and aggressive acts were recorded. Aggressiveness between family members increased from July until October, leading to a more scattered use of the available space. Furthermore, the mean activity level of family members increased, and the synchrony of activity decreased. We conclude that social tension in the fox families increased gradually during the autumn, leading to dispersion of the family members. Received in revised form: 22 October 2001 Electronic Publication