Warm-blooded animals which maintain body temperature within a narrow range in spite of wide fluctuations in environmental temperature. They are the animals that have a constant body temperature. It can maintain their internal body temperature.
Cold-blooded animals in which body temperature fluctuates within environmental temperature over a considerable range. They are the ones who cannot maintain their body temperature and it changes according to the temperature of the surrounding.
Fig: Homeothermic and Poikilothermic Animal
Difference between homeothermic and poikilothermic animal –
Poikilothermic animal –
- Poikilotherms are animals whose body temperature adjusts depending on the environment.
- They are called cold-blooded animals.
- Body temperature fluctuates within environmental temp.
- Undergoes migration and hibernation during cold.
- Temperature adjusting mechanism is rudimentary.
- Hypothalamus does not act as a thermoregulatory center in the brain.
- Examples: Reptiles, amphibian, inverte-brates, Pisces, and amphibians.
Homeothermic animal –
- Homeotherms are animals that have a constant body temperature.
- They are called warm-blooded animals.
- Fluctuates within a narrow range,
- Does not undergoes migration and hibernation,
- Well developed.
- Hypothalamus acts as a thermoregulatory center in the brain.
- Example: Mammals, Birds.