Abstract The study of mammalian societies and other similar social groups requires identification of group members and documentation of their spatial organization. Ultrawide band technology is a pioneering research technique that allows real-time automatic recording of the location of each group member. Cats living in a group were equipped with active transponders on their collars over a 2-week period. Cats traveled on average 965 ± 360 m per day, spending 30% ± 7% of their time moving. Their activity was characterized by 4 peaks of activity: 2 in the morning, another in the midafternoon, and the last at sunset. They spent most of their time in resting places, only 1 hour in the feeding area and a few minutes in the drinking and elimination areas. They interacted on average 53 ± 9 times with each other during the 24 hours they spent together per day and 32 ± 7 times with humans. This approach provides a new system to monitor groups of animals more accurately than Global Positioning System technology in indoor environments and in a much more convenient way than passive radiofrequency identification.