What is a pikilothermic?

Answer 1

Poikilothermic organisms, also known as ectotherms, are animals whose body temperature varies with the environment. Unlike endothermic animals, which maintain a constant internal temperature regardless of external conditions, poikilotherms rely on external heat sources to regulate their body temperature. This group includes species such as reptiles, amphibians, and most fish, which often exhibit behaviors like basking in the sun or seeking shade to manage their thermal needs.