It was previously considered to be conspecific with the Western Marsh Harrier (Circus aeruginosus) but is now usually classified as a separate species.
Males pale grey (except Marsh Harrier), usually smaller than brown females; immatures brown or deep buff.
The best time for Marsh Harrier is late April to mid-May.
Two pairs of Western Marsh Harriers nested for the first time in newly created reed in 2002.
A pair of Marsh Harrier (Circus aeruginosus) bred on Teän in 2008 with two juveniles seen.
The Marsh Harrier is now usually split into several species, sometimes as many as six.
Other sightings have included Kingfisher, Marsh Harrier, Osprey and Otters.
A Marsh Harrier, of which only a handful of pairs nest in Scotland, was seen on the island in September 2006.
This is the only site in Somerset where the nationally rare Marsh Harrier (Circus areuginosus) breeds.
Formerly, a number of relatives were included in C. aeruginosus, which was then known as "Marsh Harrier".
Wörterbuch für Begriffe aus dem Bereich Zoologie