The term 'long-billed wading birds' refers to a group of birds known as ibises. Ibises are a type of wading bird that have long, curved bills and typically inhabit wetlands, marshes, and other shallow water areas. They are found in many parts of the world, including Africa, Asia, Europe, and the Americas. Ibises are omnivorous, meaning they feed on both plants and animals, and they often hunt in groups. They are also known for their elaborate courtship displays.