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Medians + interquartile ranges of eye temperature of hens after equipping with a backpack (solid black ●) or being held (dotted grey 
). Significant differences and trends as shown by Wilcoxon signed rank tests: *** P < 0.001, ** P < 0.01, * P < 0.05, # P < 0.10. Although results from backpacked and non-backpacked hens were obtained within the same sessions, results for the hens that were equipped with backpacks are shown slightly to the right for visualization purposes.
