ACKNOWLEDGEMENTS
We thank Tamás Székely for his advice regarding data collection and
manuscript writing. We thank Mallory Eckstut (www.liwenbianji.cn/) for
linguistics comments. Thanks to Li Xu, Zihao Song, Xiao Huang and Xin
Lin for their assistance at fieldwork. This research was funding by the
China Postdoctoral Science Foundation (No. 2019M663221) and the British
Ornithologists’ Union’s Career Development Bursary to ZS; the Open Fund
of Key Laboratory of Biodiversity Science and Ecological Engineering,
Ministry of Education to YL.