Abstract: Bird migration is a key ecological process that sustains ecosystem connectivity, material cycling, and population persistence, yet traditional observation methods have long constrained our understanding of birds′cross-scale movement dynamics because of limited temporal continuity and spatial coverage. Guided by the movement ecology paradigm of internal state, motion capacity, navigation capacity, and external factors, this review synthesizes current knowledge on multi-scale avian movement, migratory navigation, and the evolution of monitoring technologies. It highlights the transition from bird banding to satellite tracking, radar ornithology, and the emerging Internet of Animals, and shows how the integration of movement trajectories with multi-source remote sensing and environmental annotation platforms is transforming avian research from descriptive documentation into quantitative inference of environment-state-movement interactions. Drawing on China′s monitoring and conservation context, the review further identifies major gaps, including limited taxonomic coverage of tracking, weak ground-based receiving networks, fragmented data-sharing mechanisms, and insufficient research on phenological mismatch under climate change. It then proposes a strategic pathway for developing an integrated space-air-ground monitoring infrastructure, a national wildlife movement database, and intelligent analytical and forecasting platforms. The ongoing transition of avian movement ecology toward the Internet of Animals era will provide critical scientific support for flyway conservation and restoration, biodiversity governance, and responses to global environmental change.