The plateau pika (Ochotona curzoniae), a round-eared relative of rabbits, lives on China’s Qinghai–Tibet plateau, where the air is thin and winter temperatures often drop below −30 °C.

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This hypothesis was explored using data on the American pika (Ochotona princeps), a small, diurnal lagomorph closely related to rabbits that uses rocky microhabitats for shedding heat between bouts of ...