根据句子意思,写出所指动物的英文单词

根据句子意思,写出所指动物的英文单词
（）3.They are very tall.They walk slowly.They have long legs and long necks.They can eat the leaves at the tops of trees.
（）4.They do not have legs but they can move fast.They can open their mouths really wide.they can eat big animals.