Candidate model set 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).

s (sun angle), r (nestling requirements), n (night length), c (country), p (prey availability).
ΔAICc = difference in AICc relative to the best model; wi = ΔAICc weight of the model. All models with AICc weight (wi)≥0.001 are shown.