Abstract
Abstract Adult male badgers were housed in outdoor pens equipped with an infra‐red actographic system, in the Chize forest (Western France: 46°19'N; 00°24'W). Various parameters characterizing the diurnal general locomotor activity rhythm were measured: duration of the total activity phase and the actual activity outside the burrow in relation to sunset, sunrise or night duration, activity of passage and profile of seasonal variations. Simultaneously the thyroid activity was controlled by bi‐monthly or monthly measurements of plasma thyroxine concentration. 1. In the nycthemeral rhythm of general locomotor activity, there is a close synchronization between the beginning of the activity phase and sunset; nevertheless, from November to March, the beginning of activity occurs 2 h or more after sunset. The end of activity always takes place before the sunrise (anticipation mechanism) and the delay exhibits a seasonal variation (minimum in summer, maximum in late autumn‐early winter). 2. General locomotor ac...
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