Abstract
The locomotor activity of two Virginia opossums was measured under D 24 and LD 12:12 conditions. Ss were inactive during the day and displayed two peaks of activity at night. The length of the activity period was approximately 24 h. Under LD 12:12 the nocturnal cycle was more pronounced than under D 24. The period length and topography of the opossum’s locomotor activity cycle are comparable to those obtained from other nocturnal mammals under similar lighting conditions.
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