1. Birds are considered homoiothermal because they can regulate their body temperature to stay warm in cold weather.
鸟类被认为是同温动物，因为它们可以调节体温在寒冷的天气里保持温暖。

2. Mammals are homoiothermal animals because they can maintain a constant body temperature regardless of external conditions.
哺乳动物是同温动物，因为它们可以在外部条件不同的情况下保持恒定的体温。

3. Humans are not considered homoiothermal because our body temperature can fluctuate depending on the environment.
人类不被认为是同温动物，因为我们的体温会根据环境而波动。

4. Reptiles are ectothermic animals and are not homoiothermal like mammals and birds.
爬行动物是外温动物，不像哺乳动物和鸟类一样是同温动物。

5. Some fish are able to maintain a stable body temperature in cold waters, making them homoiothermal in nature.
一些鱼类能够在冷水中保持稳定的体温，使它们在性质上是同温动物。

6. Homoiothermal animals have an advantage in cold climates because they can regulate their body temperature to stay warm.
同温动物在寒冷气候中具有优势，因为它们可以调节体温保持温暖。