Fig. 1From: Elevational patterns of bird species richness on the eastern slope of Mt. Gongga, Sichuan Province, ChinaLocation of study area, invertebrate sampling sites and bird survey transects. The study area was separated into 8 sampling elevation bands (from 1200 to 4400 m). Bird survey transects in 2012 and 2016 are indicated by pink lines, while by dark lines in 2017Back to article page