Mammals are covered by hair or fur, have a backbone and are warm-blooded.
All female mammals produce milk for their young.
Reptiles are covered by scales and include snakes, lizards and turtles.
Reptiles have a backbone and are cold-blooded, which means they often rely on external sources of heat.
Birds are covered by feathers and are warm-blooded.
Most birds can fly and many types of birds migrate great distances.
Most insects such as ants and bees have a small, 3-part body with 3 pairs of legs.
Some insects, like mosquitoes, spread diseases that cause the deaths of many humans.
Unlike animals, plants get the energy that they need from the sun.
Plants convert light energy, along with carbon dioxide and water, into chemical energy.
哺乳动物被毛发覆盖，有脊椎骨，是温血动物。所有的雌性哺乳动物都为它们的后代产奶。爬行动物被鳞片覆盖，包括蛇、蜥蜴和乌龟。爬行动物有脊椎骨，是冷血动物，这意味着它们经常依赖外部热源。鸟类被羽毛覆盖，是温血动物。大多数鸟会飞，许多种类的鸟会长途迁徙。大多数昆虫，如蚂蚁和蜜蜂，都有一个由三部分组成的小身体和三对腿。一些昆虫，如蚊子，传播导致许多人死亡的疾病。与动物不同的是，植物从太阳中获取所需的能量。植物将光能、二氧化碳和水转化成化学能。
