Northern Goshawk

The Northern Goshawk (Accipiter gentilis) is a medium-large  bird of pry in the family Accipitrideae, which also includes other diurnal raptors, such as eagles , buzzards and harrier.
The Northern Goshawk is the largest member of the genus Accipititer. It is a raptor with short, broad wings and a long tail, both adaptations to manoeuvring through trees in the forests it lives and nests in. Across most of the species's range, it is blue-grey above and barred grey or white below, but Asian subspecies in particular range from nearly white overall to nearly black above. Adults always have a white eye stripe. Males are 49–57 cm (19–22 in) long with a 93–105 cm (37–41 in) wingspan. The female is much larger, 58–64 cm (23–25 in) long with a 108–127 cm (43–50 in) wingspan. Males of the smaller races can weigh as little as 630 grams (22 oz), whereas females of the larger races can weigh as much as 2 kg (4.4 lb). The juvenile is brown above and barred brown below. The flight is a characteristic "five slow flaps – straight glide". You can find more information on: wikipedia.org, google and many other places.