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response that enables cathemeral animals to minimize thermoregulatory stress and costs associated with maintaining temperature homeostasis. A comparison between diurnal activity and ambient temperatures showed that cathemeral individuals demonstrate the least activity during the hottest part of the day and exhibit an increase in nocturnal activity, therefore exhibit a decrease in diurnal activity during the hot wet seasons. For example, to reduce heat stress, eastern grey kangaroos (Macropus giganteus)

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