Figure 1
From: Visual discrimination of polymorphic nestlings in a cuckoo-host system
Colour (a) and luminance (b) just noticeable differences (JND, mean ± 95% CI). Horizontal bars with P values indicate pairwise comparisons between groups or regions. Higher JND values indicates higher colour differences in the eyes of host parents between nestling types in each group. Sample size (number of comparisons) for dorsum and skin regions are Bright-Dark = 60, Cuckoo-Bright = 45, Cuckoo-Dark = 12 and for the flanges region are Bright-Dark = 27, Cuckoo-Bright = 18, Cuckoo-Dark = 6.
