要回答这些问题不仅需要弄清野生鸟类的迁徙途径，还需要弄清它们是否携带了潜伏在大型养殖场中的病毒。
Those studying the disease needed to know where wild birds were migrating and whether they carried the virus from its incubation points in large duck and chicken farms.
对迁徙中途停歇生态学的研究有利于更好地了解鸟类的迁徙规律及行为，更加有效地保护迁徙鸣禽种类。
Further research on stopover ecology is urgently needed in China for a better understanding of the behavior and for the conservation of these songbird migrants.
2003年冬季，作者相继在关中平原东部的黄河湿地、陕北榆林淡水湖泊区以及汉江流域对雁形目鸟类的迁徙状况进行了研究。
Researches on stopover during migration of Anatidae birds were carried at Yellowriver wetland, freshwater lake areas in Yulin city and Hanjiang river in winter from 1998 to 2003.
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