Marsh Harrier (Circus aeruginosus) couple on parade in a meadow in spring, Danube Delta, Romania

circus aeruginosus reed bed spring female male couple flap wings courtship behaviour fly to profile shot overview delta biosphere reserve circus danube unesco's world heritage natura 2000 network ramsar convention site least concern may marsh harrier circus aeruginosus danube delta biosphere reserve nobody reed beds females males flapping wings flaps wings flutter parading parade parades seducing courtship behaviours seduce attractive seduction in flight flight flights flying profile sights profile sight profile shots profile view profile views side view overviews global sight global sights full length deltas biosphere reserves world heritage site natura 2000 networks ramsar convention sites least concern species with nobody low wetland area freshwater wetland area area temperate season seasons atmosphere individual pair enumeration locomotion motion reproductive behaviour behavior shot brackish water environment protection environment management biodiversity management environment accipitridae falconiformes aves tetrapoda vertebrata chordata deuterostomia coelomata bilateria metazoa opisthokonta eukaryota world river convention on international trade in endangered species of wild cites species low risk iucn) lr iucn red list of threatened species harrier prey diurnal bird bird wild animal romania europe