Frogs are considered cold-blooded animals, more accurately known as ectothermic animals, because they rely on external sources of heat to regulate their body temperature.

Here's a breakdown:

• Ectothermy: Ectothermic animals cannot internally regulate their body temperature like mammals and birds (endothermic animals) do. ¹
• Environmental Dependence: A frog's body temperature fluctuates with the temperature of its environment. If it's cold outside, the frog's body temperature will drop; if it's warm, the frog's body temperature will rise. ²
• Behavioral Regulation: To maintain a suitable body temperature, frogs engage in behaviors such as basking in the sun to warm up or seeking shade or water to cool down.

This adaptation allows them to survive in various environments, but it also means their activity levels are heavily influenced by the ambient temperature.