cold-blooded animals

Cold-blooded animals, also known as ectotherms, are creatures whose body temperature varies with their environment. Unlike humans, who generate heat internally, these animals rely on external sources such as the sun to warm up or shade to cool down. This means their activity levels often depend on the weather; they may be sluggish on cold days and more active when it's warm. Common examples include reptiles, amphibians, fish, and invertebrates. Their reliance on environmental temperature helps conserve energy, but also limits their activity during unfavorable conditions.