ornithological

例句：

1. 1. Ornithologists study the behavior of birds in order to understand their evolution.
   鸟类学家研究鸟类的行为，以了解它们的进化。
2. 2. The research on bird migration has greatly advanced our understanding of climate change.
   关于鸟类迁徙的研究极大地增进了我们对气候变化的理解。
3. 3. Birds are an important part of our ecosystem and should be protected for future generations.
   鸟类是我们生态系统的重要组成部分，应该被保护，以便为后代留下。