poikilo
Poikilo is a term used in biology and ecology to describe organisms that are unable to regulate their internal environment and whose internal conditions vary with the external environment. This means that their body temperature, salinity, or other physiological factors fluctuate in response to changes in their surroundings. Organisms that exhibit poikilothermy are often referred to as "cold-blooded," although this term can be misleading as their body temperature can sometimes be warmer than the ambient temperature, especially during periods of activity.
Poikilothermy is common in many animal groups, including reptiles, amphibians, fish, and invertebrates. These animals rely
In contrast, homeothermic or endothermic organisms, such as mammals and birds, maintain a stable internal body