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Along with a disgruntled squark, some chickens also blush when you swoop down and scoop them up. A new study suggests that, so University of Tours ethologist Delphine Soulet and colleagues examined this trait to see if it's also an indicator of emotional states in chickens during these different scenarios.In contrast, more facial redness appears to indicate higher emotional arousal, including excitement when encountering a favored food like mealworms, or fear.
Soulet and colleagues also gradually exposed 13 Sussex hens to the presence of an experimenter over a five week period while another 12 were left alone. "Habituated hens exhibited significantly lower fearfulness and facial skin redness in the presence of humans compared to non-habituated hens in the reactivity to human test," the researchers
"We propose that changes in facial skin redness reflect variations in affective states and can be used as a marker for assessing the quality of the human-hen relationship." With some further research facial redness could become a powerful indicator of chicken welfare. It could also be useful in interpreting social interactions and hierarchies between individual birds – something the researchers are keen to explore as well.we shaped the evolution of these birds from wild junglefowl to domestic poultry.
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