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In Korea, marine species that are considered to face challenges to their survival or require protective measures are designated as `protected marine species` and managed accordingly. As of February 2023, a total of 91 species are being managed as protected marine species pursuant to the Marine Ecosystems Act. This year, Korea Post is issuing the sixth collection of its commemorative stamp series Protected Marine Species featuring four species of seabirds that are at risk of becoming endangered species. The Saunders`s gull (Chroicocephalus saundersi) typically inhabits mud flats and estuaries in brackish water near the sea. With a population of over 3,000 birds, it breeds in the northeastern region of China and migrates to Korea for the winter. In 2022, 1,456 breeding pairs were observed along the west coast foreshore, accounting for 11% of the global population. The oystercatcher (Haematopus ostralegus) is known to form colonies around mud flats, deltas, and rocky areas of islets, and it primarily feeds on crabs, lugworms, and various shellfish. However, these habitats have been significantly impacted by reclamation projects and marine pollution, leading to substantial population fluctuations from year to year. While more than 3,000 birds winter in the mudflats of Yubudo Island on the west coast annually, the oystercatcher is a rare species with a limited range in Northeast Asia, including Korea. The Far Eastern curlew (Numenius madagascariensis), which breeds in Siberia and migrates through Korea to winter in Southeast Asia and Australia, is a relatively common migratory bird observed in Korea during spring and autumn. Habitat destruction and pollution have led to a significant decline in their numbers. Currently, there are approximately 32,000 birds worldwide. As for the black-faced spoonbill (Platalea minor), over 90% of the global population breed on islets off the west coast of Korea, while a small number of individuals spend their winters on Jeju Island. They inhabit shallow coastal waters, mudflats, reed beds, and rice paddies. These birds display cautious behavior, and there are approximately 5,000 birds worldwide. This sixth collection of commemorative stamps highlights these four seabird species that inhabit coastal areas, presenting vibrant and lifelike images that capture the distinct characteristics and colors of these rare classified species. We hope this commemorative stamp series serves as an opportunity to learn about and reflect upon the importance of protecting and conserving these marine species in their natural habitats.