Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 马库斯、亨弗莱和达雷尔正在观鸟。马库斯看到7只鸟，亨弗莱看到11只鸟，达雷尔看到9只鸟。他们每个人平均看到多少只鸟？


### Response:
 他们总共看到7+11+9=<<7+11+9=27>>27只鸟。
所以每个人平均看到27/3=<<27/3=9>>9只鸟。