While the time of light exposure of the eggs varied from day
to day and differed to some extent between the pigeon pairs
(Fig. 2), the long-term mean exposure time of the nest was approximately the same for all five pairs and ranged between
10:47 and 15:45 min per day with a mean of 14:11 min. The
overall exposure time during the observed 16 breeding days varied
between 2:53 and 4:12 h with an overall mean of 3:47 h. The
homogeneous course of light exposure times also increased on
day 3, however, the number of relieves are increased