Statistical analyses (Generalized Linear Mixed Models: GLIMMIX module in SAS 9.3) of factors affecting the (a) number of prey items (Poisson distribution, log-link), and (b) the average prey mass delivered to nest within half-hour intervals (Lognormal distribution, identity-link) in the Czech popul

Box identity nested within country was added as a random factor to the model to control for the repeated measurement at the same nest boxes.
1: sun angle (in degrees) in relation to the horizon. 0° = sunrise/sunset.
2: calculated as the product of number of nestling×age of oldest nestling.
3: duration of the night: minutes between sunset and sunrise.