The Mute Swan was introduced to the United States in the late 1800s, primarily for its ornamental value. Recently, it has been widely viewed as an invasive species because of its rapidly increasing numbers and impacts on other waterfowl and native ecosystems. For example, a study of population sizes in the lower Great Lakes from 1971 to 2000 found that Mute Swan numbers were increasing at an average rate of at least 10% per year, doubling the population every 7 to 8 years. Several studies have concluded that Mute Swans severely reduce densities of submerged vegetation where they occur. I don’t know about all that, I just like looking at them. I found this big boy at a local lake in Morris County, NJ.