这本书着眼于我们共同生活的一些冷血动物：爬行动物、两栖动物和鱼类。这些动物可能不像某些动物那样毛茸茸、可爱，但它们拥有自己独特的魅力。爬行动物和两栖动物在许多方面相似，但它们之间有一些关键的区别。爬行动物通常会产卵，大部分时间生活在陆地上（尽管也有少数例外）。它们的皮肤通常有鳞片，干燥，不粘腻。两栖动物在水中产卵。当这些卵孵化时，幼卵看起来不像成年卵的微型版本；相反，它们是某种幼虫（比如青蛙蝌蚪）。
这些幼仔在水中生活，直到它们蜕变成成年。大多数成年两栖动物可以在陆地上活动，但通常仍然需要至少一些潮湿的条件才能保持健康。两栖动物的皮肤通常是光滑的或疣状的，看起来潮湿或有光泽。
How to Draw Cold-Blooded Animals Step-By-Step for Student: The Cold-Blooded Creatures We Share Our Lives With
This book looks at some of the cold-blooded creatures we share our lives with: reptiles, amphibians, and fish. These animals may not be as furry and cuddly as some, but they possess distinctive charms of their own. Reptiles and amphibians are similar in many respects, but there are a few key differences between them. Reptiles usually lay leathery eggs and live most of their lives on land (though there are a few exceptions). Their skin is usually scaly and dry, not slimy. Amphibians lay soft eggs in water. When those eggs hatch, the young do not look like miniature versions of the adults; instead, they are some kind of larva (such as frog tadpoles).
These young live in the water until they undergo metamorphosis into adults. Most adult amphibians can move about on land, but usually still require at least somewhat moist conditions to stay healthy. Amphibian skin is usually smooth or warty, with a moist or glossy look to it.
OR
