Conservation researchers at the Dongsha Management Station of the Marine National Park Headquarters (hereinafter referred to as the Headquarters) conducted a terrestrial avifauna survey on Dongsha Island in April 2010. The results indicate that this period marks the peak of migratory bird movement, with both species diversity and population numbers reaching remarkable levels.

The Grey-faced Buzzard, recorded annually during migration, showed particularly impressive numbers this year during its northward return. Flocks peaked at more than twenty individuals at a time, with a cumulative total exceeding 250 birds. Especially at dusk near the lagoon mouth, one can witness the spectacular sight of buzzards descending to roost—seemingly relieved after a long journey across the sea to finally find a resting place—evoking a sense of tranquility and serenity. In addition, Crested Goshawk, Japanese Sparrowhawk, Chinese Sparrowhawk, Northern Goshawk, Eastern Buzzard, and Osprey can all be readily observed daily.

In the open fields of Dongsha Island during spring, Cattle Egrets can be seen having changed into their bright yellow breeding plumage, foraging alongside Little Egrets in the grasslands of the island’s central area or flying gracefully at low altitude over native shrublands. Along the shores of the inner lagoon, hundreds of herons and egrets—including Cattle Egrets, Intermediate Egrets, and Little Egrets—gather in impressive numbers. When they take flight together, the scene is truly magnificent. Additionally, the Chinese Pond Heron, a species less commonly observed in Taiwan, can be easily spotted at Dongsha. At this time, they are heading toward their breeding grounds in northeastern China, Mongolia, and Siberia. While flying over the lagoon, they display striking breeding plumage: white wings and tail feathers contrasting vividly with reddish-brown head, neck, and back. Black-winged Stilts, Ruddy Turnstones, Brown Shrikes, and Barn Swallows are also present in large numbers.

Spring marks the season when migratory birds return north to their breeding grounds. Amid the vast ocean, Dongsha Island’s rich and diverse marine ecosystem provides a vital stopover site where birds can rest and refuel. This underscores Dongsha’s position along an important migratory flyway. The Headquarters stated that it will continue efforts to restore native coastal forests, aiming to revive the lush landscape of Dongsha Island as it existed a century ago, and to ensure a safe return journey for migratory birds.