Vestamager is a paradise for ornithologists, and because of the location of one of the important migratory routes between northern Scandinavia and southern Europe, rare birds also visit this area. Vestamager has been designated as a Natura 2000 site because of the presence of marsh harriers, Eurasian curlews, pintails, dunlin, Arctic terns and short-eared owls, most of which are critically endangered, as well as tufted ducks, goosanders, smew and mute swans, that all spend the winter here. The mute swan is Denmark’s national bird, and almost a third of the total population gathers in and around Vestamager.
It is also possible to see or hear nightingales, bittern, white-tailed eagles, common buzzards, cormorants, harriers and many breeding wading birds, gulls and terns.
A small area in the southwestern part of Vestamager is a closed-off bird sanctuary with no admission, but with good bird towers and bird hides on the perimeter.