Aggregated distribution of Anser indicus nest in Bayinbuluke of Tianshan Mountains and its breeding ecology Population, distribution and home range of wintering bar-headed goose along Yaluzangbu River, Tibet The Effect of Sample Pretreatment on Stable Carbon and Nitrogen Isotope Ratios of Bar-headed Goose Tissues Movement and habitat utilization of breeding Bar-headed Goose and the relationship with humans in Qinghai Lake