Appearance is different: Haiyan is usually very small, with long and pointed wings, a slender and pointed beak, and its feathers are mostly black or gray. On the other hand, seagulls have large bodies, wide wings, short hooked beaks, and mostly white or grayish white feathers. Different living habits: Haiyan mainly lives near the ocean, mainly preys on insects and small fish by flying, and is good at gliding and hovering in the air. Seagulls are common in coastline and inland waters, mainly preying on fish, shellfish and garbage, and are good at walking on the ground and floating on the water for food.