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Birds have their own central heating system

At some stage during your Biology course, you will have studied temperature regulation in mammals. Like mammals, birds are endothermic. As Martin Rowland explains, if you live in a temperate zone, the small birds with which you are familiar have a way of warming themselves that mammals lack

By ‘fluffing up’ its extra down feathers, this Eurasian blue tit reduces heat loss from its body during the winter months
© AlekseyKarpenko/stock.adobe.com

AQA Respiration; Homeostasis

OCR A The physiological and behavioural responses involved in temperature control in ectotherms and endotherms

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