The ability of an animal to control its body temperature is influenced by its surface area to volume ratio.
Animals with a low surface area to volume ratio tend to lose heat more slowly, which can help them maintain their body temperature better in colder environments. This generally applies to larger animals. On the other hand, animals with a high surface area to volume ratio (typically smaller animals) lose heat more quickly, which can make it challenging for them to regulate their body temperature.
Ectotherms (cold-blooded animals) rely on external sources of heat to regulate their body temperature and typically do not have the ability to maintain a constant internal temperature independently.
Amphibians also typically rely on their environment for temperature regulation and do not have the same level of control as endotherms (warm-blooded animals).
Therefore, the best answer from the options would be:
animals with a low surface to volume ratio.