The Eurasian Marsh-Harrier (Circus aeruginosus) is a medium-sized bird of prey that is found throughout much of Europe, Asia, and northern Africa. It measures about 18 to 23 inches in length, with a wingspan of approximately 40 to 46 inches. This species has a distinctive facial disc that is pale in color and is bordered by a dark ring. The males have a gray head and body, while the females and juveniles are brown.

Eurasian Marsh-Harriers are migratory birds, spending their winters in Africa and returning to their breeding grounds in Europe and Asia during the spring and summer months. They breed in wetlands, such as marshes, reed beds, and swamps, where they build nests on the ground or in tall vegetation. They feed on a variety of prey, including rodents, birds, and amphibians.

One of the most distinctive features of the Eurasian Marsh-Harrier is its flight pattern. They have a buoyant, undulating flight, with their wings held in a V-shape. They often fly low over the wetlands, looking for prey, and are known for their acrobatic displays during courtship.

Eurasian Marsh-Harriers are listed as a species of least concern by the International Union for Conservation of Nature (IUCN). However, they are still threatened by habitat loss and degradation, particularly in their breeding grounds in Europe. Conservation efforts are underway to protect their wetland habitats and ensure the survival of this beautiful bird of prey.

Overall, the Eurasian Marsh-Harrier is a fascinating bird of prey that is well adapted to life in wetland habitats. Its distinctive appearance and flight pattern make it a joy to watch for birders and nature enthusiasts alike.