Hen Harrier
Circus cyaneus
The hen harrier is 41–52 cm (16–20 in) long with a 97–122 cm (38–48 in) wingspan. It resembles other harriers in having distinct male and female plumages. The sexes also differ in weight, with males weighing 290 to 400 g (10 to 14 oz), with an average of 350 g (12 oz), and females weighing 390 to 750 g (14 to 26 oz), with an average of 530 g (19 oz). Among standard measurements, the wing chord is 32.8 to 40.6 cm (12.9 to 16.0 in), the tail is 19.3 to 25.8 cm (7.6 to 10.2 in) and the tarsus is 7.1 to 8.9 cm (2.8 to 3.5 in). It is relatively long winged and long tailed.
ID text from Wikipedia, CC BY-SA 4.0
Western Marsh Harrier
Circus aeruginosus
The western marsh harrier is 48 to 56 cm (19 to 22 in) in length, has a wingspan of 115 to 130 cm (45 to 51 in) and a weight of 400 to 650 g (14 to 23 oz) in males and 550 to 800 g (19 to 28 oz) in females. It is a large, bulky harrier, larger than other European harriers, with fairly broad wings, and is sexually dimorphic. The male's plumage is mostly a cryptic reddish-brown with lighter yellowish streaks, which are particularly prominent on the breast. The head and shoulders are mostly pale greyish-yellowish.
ID text from Wikipedia, CC BY-SA 4.0
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