What kind of thermoregulate do eels live in?

Eels are ectothermic animals, which means that they rely on external sources of heat to regulate their body temperature. They often live in water bodies such as rivers, lakes, and oceans, which provide a relatively stable thermal environment. Some species of eels may also inhabit mudflats or shallow coastal areas with fluctuating temperatures. To cope with changes in external temperature, eels may adjust their behaviour, such as seeking shade or moving to deeper water, to maintain an optimal body temperature for survival.