ML645564668

観察結果の詳細

Immature bird, perched on heronry island opposite viewpoint for 45 minutes, then flying low around the pit chasing gulls. The bird lacked a tail (actually had a short re-growing tail). Superficially resembling Eurasian Goshawk though underparts seemed to be too white and the streaking too fine. The wing shape in flight was OK for Goshawk (broader arm, slightly tapered hand) and the bird was a decent size. I circulated the photos to a few people for comments; Ashley Banwell contacted a breeder who said they had bred a Eurasian Goshawk with that colour underparts and they sent a photo (though it had broader breast streaking), however they subsequently commented (after seeing a further selection of photos) that it is probably a falconer bred bird of mixed parentage. According to Forsman in Flight ID of European Raptors "the ground colour of underparts varies from tawny-buff to white, and markings vary from narrow streaks to broader spearheads..." , there are a few photos (though not many!) of immatures on ebird with a similar plumage to this bird. Based on that, ID as Eurasian Goshawk is possibly acceptable, though comments to the contrary are welcomed. The bird had no jesses, photos show no ring on right leg and there seems to be no ring on left leg (though not all of the left leg is visible). Most of the photos (the better ones) were taken by Phil Ball. Weird bird! [Having studied a number of images, I fancy that the bird was probably an immature Cooper's Hawk - looks a pretty good fit, so surely an escape.]