some passerine birds have specialized vocal apparatus. 一些燕雀类鸟有特殊发音器官。
The combination of these conditions provides an ideal refuge, especially for passerine migrants in early spring. 这些条件结合在一起提供了理想的避难所，对于早春迁徙到此的雀形目鸟类尤其如此。
This passerine bird is found in Australia and Papua New Guinea. 这种雀科鸟类一般能在澳大利亚和巴布亚新几内亚看到。
