pigeon

The tourist sat on the bench in the park feeding crumbs to a flock of pigeons.

(Chinese) 游客坐在公园的长椅上，把面包屑喂给一群鸽子。

In the past, carrier pigeons were trained to deliver urgent messages across long distances.

(Chinese) 在过去，信鸽被训练用来长途传递紧急信息。