Group 1 - The core issue reported is the observation of a large number of birds flying low over the city of Xilin Gol League, Inner Mongolia, which raised concerns among residents [2] - The meteorological bureau of Xilin Gol League confirmed that no abnormal weather data was detected during this period [2] - The forestry and grassland bureau clarified that the low-flying birds are migratory species, indicating that this phenomenon is a normal occurrence [2]

Group 1 - The core viewpoint of the articles highlights the significant migration of various bird species to specific wetlands in China, particularly in Jiangxi Poyang Lake and Yunnan Dianchi, during the peak migration season in October [1][3][4] - The Poyang Lake Nanji Wetland is identified as a crucial stopover on the East Asia-Australasia migratory route, serving as a wintering ground for endangered species such as the white crane and the oriental white stork [3] - Local authorities have taken proactive measures to ensure a suitable habitat for the migrating birds by monitoring water levels and enforcing laws against ecological destruction [3] Group 2 - In Kunming, Yunnan, the arrival of hundreds of red-billed gulls at Dianchi Lake has attracted many visitors, marking the beginning of the bird-watching season [4] - The phenomenon of "eagle columns" was observed in Hefei, Anhui, where over 300 raptors were seen utilizing thermal updrafts to soar together, creating a unique visual spectacle [6][11] - The peak migration period for raptors is noted to be from late September to early October, with specific weather conditions influencing their collective movement southward [11]

Core Viewpoint - The number of bird species in the Hulun Lake National Nature Reserve has increased significantly, with a total of 75,311 birds recorded in the autumn of 2025, representing a nearly 40% increase compared to the previous year [1][4]. Summary by Sections Bird Population Increase - The reserve recorded 75,311 birds, an increase of 21,442 birds from the autumn of 2024, marking a growth of nearly 40% [1][4]. - The monitoring identified 68 species across 10 orders, 22 families, and 41 genera, with a focus on national second-class protected species such as the swan goose, white spoonbill, and whooper swan [4]. Importance of Hulun Lake - Hulun Lake, covering an area of 2,339 square kilometers and at an elevation of 545.5 meters, is one of China's five major freshwater lakes and the largest lake in Inner Mongolia [2]. - The lake serves as a crucial migratory pathway for birds along the East Asia-Australasia flyway and is an important breeding ground for waterfowl in Northeast Asia [2]. Monitoring and Conservation Efforts - The Hulun Lake Nature Reserve employs dynamic monitoring and video surveillance to track bird populations, habitat conditions, and disease dynamics, ensuring the protection of this vital migratory corridor [6].

Core Points - The article discusses the arrival of the autumn solar term "Bailu," marking the transition to cooler weather and the increase in temperature differences between day and night [2] - It highlights the migration of birds during this period, particularly in the Suzhou Taihu region, which is an important wetland for migratory birds along the East Asia-Australasia flyway [2] - The article mentions the implementation of wetland protection laws in China, aimed at preserving habitats for migratory birds and contributing to global biodiversity [2] Summary by Sections - **Seasonal Changes**: The Bailu season signifies the end of summer heat and the onset of cooler temperatures, with increased humidity leading to dew formation [2] - **Bird Migration**: The article notes that during Bailu, migratory birds such as geese and swallows begin their journey southward, seeking warmer climates for winter [2] - **Cultural Practices**: Traditional customs during Bailu include "Bu Lu," which involves consuming foods like longan and tremella to combat autumn dryness, reflecting the harmony between humans and nature [2] - **Local Traditions**: In the Suzhou-Zhejiang area, there is a tradition of brewing and serving "Bailu rice wine," which is slightly sweet and warming, aligning with the seasonal changes [2]