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Histograms of 9999 averaged (a) chromatic and (b) achromatic contrasts between cuckoo eggs (n = 19) and all host clutches (n = 61) with a similar egg-laying date obtained from the randomization procedure. Arrows denote positions of values of mean contrasts between cuckoo eggs and host clutches in naturally parasitized nests (p-values given). Only results for UVS bird colour vision presented. (Online version in colour.)
