请阅读下面文字，并按照要求用英语写一篇150词左右的文章。

    Hermit crabs are nature's recyclers. They eat waste and help keep oceans and shores clean. Unlike other crabs, the hermit crab has a thin outer shell over its soft tail. This makes the hermit crab easy prey for hungry predators (天敌). Hermit crabs stay safe by living in old seashells. A hermit crab is picky(狡猾); it tries on many shells until it finds one that fits just right. In recent years, however, many hermit crabs have had trouble finding their perfect homes. Now the problem is that there are not enough shells to go around!

【写作内容】

1）用约30个词概述所给信息的主要内容；

2）用约120词针对这种现状谈谈人类应该什么措施来保护Hermit Crabs(至少三点)。

【写作要求】

1）写作过程中不能直接引用原文语句；

2）作文中不能出现真实姓名和学校名称；

3）不必写标题。

【评分标准】

内容完整，语言规范，语篇连贯，词数适当。