EN
This study on den use by red foxes Vulpes vulpes (Linnaeus, 1758) and badgers Meles meles (Linnaeus, 1758) was conducted in central Poland (51°48'N, 19°53'E) over two years. We found a strong negative correlation between monthly den utilisation rate by foxes and air temperature (r = -0.83, p = 0.0001). Correlation between temperature and den use by badgers was positive but less distinct (r = 0.40, p = 0.036). During the whole study period, a negative correlation between the monthly intensity of den use by badgers and by foxes was found (r = -0.51, p = 0.008). The seasonal pattern of den utilisation differed between the species. Foxes used the dens mainly in winter and spring whereas in summer and autumn the intensity of den utilisation sharply decreased to a minimum in August-September. A peak in den use by foxes was observed in March and coincided with rut and selection of future breeding dens. In badgers, two peaks in den use were observed: the first in April and the second in August-September. An individual badger used more dens and used them more evenly throughout the year than an individual fox. The same dens were visited by foxes and badgers mostly from January to April, with a maximum in March.