Jeff A. Horn is the first author of a 2011 study of free-roaming cats using wildlife radio telemetry and collar-mounted activity sensors. The team compared 11 owned and 16 unowned cats near Champaign-Urbana, measuring home range, use of the surrounding landscape and activity over time.[ref]
The owned cats had smaller home ranges, while the unowned group was more nocturnal and more active overall. Location and activity are different measurements: an animal can occupy a small area yet move frequently within it. Pairing the sensors therefore gave a richer description than either measurement alone. The observed owned/unowned comparison was not a randomized assignment of care, and the operational unowned category should not automatically be equated with every definition of a feral animal.[ref]

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