Adaptive latitudinal variation in Common Blackbird Turdus merula nest characteristics.

There was a marginally significant trend toward internal nest-cup depths being shallower as temperatures increased with decreasing latitude ( F 3,57 = 4.32, P = 0.042, Fig. 3 E), with post-hoc tests revealing no significant differences between any of the individual study sites (all P values >0.05).

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