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We studied daily activity patterns of 19 (7 males and 12 females) adult red deer (Cervus elaphus) by using continuous tracking sessions in Bialowieza National Park (BNP), Poland, from 2001 to 2004. Male and female red deer were active throughout the day and night during all seasons, with several peaks in activity during the 24-h period, although both sexes tended to be more active during the day in winter. There were no significant differences between males and females in mean time active (8 h/day for both sexes), mean length of activity bouts (42 min), and mean number of activity bouts (12 bouts/day). Additionally, neither sex showed seasonal differences in hours active, bout length, or number of bouts per day. However, rainfall affected activity of males, whereas ambient temperature and snowfall affected activity of females. Although red deer are sexually dimorphic, which often leads to differences in …