Group 1 - The article highlights the annual migration of the Beijing Swift, which travels approximately 16,000 kilometers from southern Africa to Beijing, showcasing its remarkable endurance and resilience [2][12][20] - The Beijing Swift is recognized as a cultural and ecological symbol of the city, with increasing attention and protection efforts contributing to its significance [3][7][14] - The swifts typically nest in the hidden spaces of ancient architecture, particularly in places like the Summer Palace, which provides ideal conditions for their breeding [14][16][20] Group 2 - Bird banding has been an important method for studying the migration patterns and behaviors of the Beijing Swift since the 1990s, with advancements in tracking technology enhancing research accuracy [21][27][29] - The banding process involves capturing the birds, measuring their physical data, and attaching identification rings, which allows researchers to track population changes and individual lifespans [23][25] - Recent upgrades to tracking devices, including light-sensitive locators and satellite trackers, have improved the precision of migration data collection [27][29][31]