Kylmäverisissä

Kylmäverisissä is a Finnish term that translates to "cold-blooded" in English. It refers to a group of animals that are ectothermic, meaning their body temperature depends on the external environment. This includes reptiles, amphibians, fish, and insects. Unlike warm-blooded animals (endotherms), which can regulate their internal body temperature through metabolic processes, cold-blooded animals rely on external sources of heat, such as the sun, to maintain their body temperature.

The physiological characteristics of cold-blooded animals are adapted to their ectothermic nature. For instance, many reptiles bask in the sun to warm up and become active, and seek shade to cool down. Their metabolic rates are generally lower than those of warm-blooded animals, which means they require less food. This allows them to survive for longer periods without eating.

The term "kylmäverisissä" can also be used metaphorically in Finnish to describe a person who is unemotional, detached, or acts without showing much feeling, particularly in stressful or high-stakes situations. This usage draws a parallel to the perceived lack of outward emotional display in cold-blooded animals. It is important to note that this metaphorical use does not imply any scientific connection to the biological classification of animals.