将下列单词按要求分类，并将其填入相应的类别中。

pencil                hand              purple            duck             blue     

squirrel             eraser              nose           sharpener        rabbit    

yellow              mouth               pig             monkey           arm        

head                  ruler               finger

1. 文具类：                                                                                       

2. 身体部位类：                                                                                

3. 颜色类：                                                                                       

4. 动物类：