Trumpeter swans on the rise in Ohio, but bird remains on state-threatened list Cameron Fields, cleveland.com CLEVELAND, Ohio — The trumpeter swan, the white-feathered bird that wades through wetlands, remains on the state’s threatened species list, though its population is growing, including in Northeast Ohio. The Ohio Department of Natural Resources recorded 650 swans in 2020, a nearly 20% increase over 2019, said Division of Wildlife wildlife biologist Laura Kearns. Trumpeter swans were reintroduced to the state about 25 years ago. Since then, the state has worked diligently to restore wetland habitats, where swans forage for the stems and leaves of waterweed, pondweeds and muskgrass among other plants.