 Dear students, in this topic we shall discuss the thermoregulatory centers in non-mammals. The thermoregulatory center in fishes lies in the hypothalamus. This regulatory center senses the body temperature and as a result responds to regulate the rate of respiration. A rise in temperature means increased body metabolism and increased body metabolism means that there is more need for oxygen, so the hypothalamus that is adapted to temperature determined adjustment in the rate of respiration. The thermoregulatory center in reptiles also lies in the hypothalamus. This hypothalamic center's activation results in reptiles' thermoregulatory responses. When the hypothalamus is cooled, then the reptiles engage in various types of thermophilic that is heat seeking behaviors and when the hypothalamus receives heating inputs, then the reptiles show thermophobic that is heat avoiding behaviors. Dear students, the thermoregulatory center in the birds is more complex and it is located somewhere in the spinal cord because the place of the hypothalamus which acts as thermoregulatory center in mammals is insensitive to temperature changes in birds. In this way, the place of mammals in the hypothalamus as thermoregulatory center, birds do not have a thermoregulatory center, so the thermoregulatory center in the birds is located in the spinal cord. The temperature sensors or receptors in the body send signals to the spinal central temperature sensor. This thermostatic center integrates the inputs and activates proper thermoregulatory effectors.