| Thermogenic mechanisms during the development of endothermy in juvenile birds | ||
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In grey partridge chicks aged 3–25 days, selection of preferred ambient temperature was studied in a temperature gradient created with infrared lamps (I). Movement activity in the thermal gradient was recorded with a video camera connected to a PC equipped with an image processing card and software. The activity counts in the four different parts of the gradient were used as an estimate of presence in different sections.