Abstract: Based on the data of the start and halt warble dates at 4 agro-meteorological observation stations in Qinghai, the response of the cuckoo's (Cuculus canorus) phenophase date to climate change was analyzed. The result show that: 1) there existed a regional difference in cuckoo's phenophase date; 2) except at Nuomuhong station, there was a trend of advancing of start warble date and delaying of halt warble date, and the interval day numbers from start warble to halt warble date prolonged at other three stations. This change trend was consistent with that of climate change, and thus we can conclude that the cuckoo?phenophase responds to the climate warming to some extent.

Key words: cuckoo, phenophase, climate change, response