Marshland waders, also known as bitterns, are a type of wading bird found in wetlands and marshes. They have long legs and a long neck, allowing them to reach into the water to feed on fish, frogs, and other aquatic creatures. Bitterns are usually brown or gray in color and have a distinctive call that can be heard from far away. They are an important part of wetland ecosystems, helping to keep the water clean and providing food for other animals.