1. My friend is an avid birder and spends his weekends exploring forests in search of rare bird species.
我的朋友是个热衷于鸟类观察的人，他每个周末都会去探索森林，寻找稀有的鸟类。

2. The local birder's club organizes regular outings for members to spot and identify different bird species.
当地的鸟类观察者俱乐部定期组织成员外出观察和辨认不同的鸟类品种。