1. Manduca sexta can behaviourally regulate its temperature, but the temperature level is not determined by a simple thermal set-point.

  2. Thermoregulation is not localized in a cephalic nervous centre.

  3. Both of these characteristics distinguish thermoregulation in M. sexta from thermoregulation as seen in vertebrates.

  4. Sustained high temperature is a requisite for flight activity, but regulation of internal temperature is a secondary feature in M. sexta subserving efficient tuning of the flight system.

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