Behavioural rhythms analysis can be considered as valid only if supported by long-term uninterrupted data collection, required to evaluate the animal-environment relationships. A storage telemetry system (Ethosysâ) which allows for the automatic registration of main behavioural patterns was tested with 34 Angora goats and 5 mouflons under free-ranging conditions. The experiment was conducted on a 20 ha area covered by woodland vegetation and divided into 3 plots according to the following experimental design: (i) goats at low density (1.7 head/ha); (ii) goats at high density; and (iii) goats at high density and mouflons (Ovis ammon musimon). Animals were under continuous set-stocking grazing management. Comparison of visual observation (scan sampling methods) and registration by automatic recording system was carried out, the latter to assess behavioural patterns (grazing, ruminating and general activity) on individual animal basis.