 In response to cold temperatures, both basal metabolic rate (BMR), and maximum metabolic rate (MMR) will increase.The rufous-collared sparrow has extensive geographical variation in its vocalisations, but calls include a sharp "tsip".The male's song, given from a low perch, typically includes slurred whistles with or without a final trill, "tee-teeooo, e’e’e’e’e", or "teeooo, teeeee".