寄居动物

例句：

1. 1. Many species of birds are known to live in the trees as migrants or residents.
   许多鸟类已知作为过客或居民生活在树上。
2. 2. The researchers found that some species of insects were living in colonies.
   研究人员发现一些昆虫物种生活在群居中。
3. 3. The lion is a resident of the African savannah and is often seen as a symbol of strength and courage.
   狮子是非洲草原的居民，常常被视为力量和勇气的象征。