Generate 16:9 landscape video. Cinematic 4K video, 15seconds, dramatic lighting, Shenzhen mangrove wetland as the core scene. Opening shot: slow-motion aerial view of hundreds of migratory birds flying over Shenzhen Bay, with the Shenzhen skyline (Ping An Finance Center) in the background, the contrast between the city's prosperity and natural beauty is striking. Then cut to close-up: a black-faced spoonbill preening its feathers on the red mangrove roots, water rippling gently. Next shot: a group of volunteers cleaning up plastic waste on the wetland beach, their movements are gentle and focused. Ending shot: birds flying in formation at sunset, text overlay in bold white Chinese characters: "Shenzhen Mangroves: Home to Migratory Birds, Guarded by Us All". Background music: epic orchestral music, softening to a warm melody at the end. No text overlays except the final slogan. Realistic style, vivid colors, high frame rate for smooth motion.