Oral, Rectal, Tympanic Temperature
Body temperature is a complex indicator of the thermal state of the organism of animals, including humans. It is one of the main and oldest biomarkers.
Animals that are able to maintain their temperature in narrow limits, regardless of the temperature of the external environment, are called warm-blooded, or homoiothermal. Warm-blooded animals include mammals and birds. Animals lacking this ability are called cold-blooded, or poikilothermic. Maintaining body temperature by the body is called thermoregulation.
In cold-blooded animals, body temperature differs little from ambient temperature, and only with intensive muscular activity in some species can it significantly exceed the ambient temperature.
Oral temperature (lat. Oris - mouth) is the temperature measured in the oral cavity.
Rectal temperature (lat. Rectum - rectum) is the temperature measured in the rectum.
Tympanic temperature is the temperature in the ear canal. Measured with a special tympanic thermometer.
Via Dr. Komarovsky & wiki