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Figure 10


Fig. 10. Colour changes of an individual U. vomeris female subjected to 3 days of dummy bird predation. Small symbols connected by thin lines show individual measurements (open circles, number of pixel values between 150 and 200; filled circles, number of pixel values between 201 and 255). Large red symbols connected by thick lines show 30 min means of numbers of pixels with values between 150 and 200 (open symbols) and between 201 and 255 (filled symbols). Inset pictures show the appearance of the crab at the given times of day and the carapace areas exhibiting pixel values between 150 and 200 (green) and between 201 and 255 (red). Arrowheads above the x-axis mark the times when the female closed her burrow.





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