{"id":7382,"date":"2017-07-24T23:55:18","date_gmt":"2017-07-24T22:55:18","guid":{"rendered":"http:\/\/birds-in-flight.net\/?p=7382"},"modified":"2020-01-31T16:25:21","modified_gmt":"2020-01-31T15:25:21","slug":"western-marsh-harrier-circus-aeruginosus","status":"publish","type":"post","link":"https:\/\/birds-in-flight.net\/?p=7382","title":{"rendered":"Western Marsh Harrier
Circus aeruginosus<\/em>"},"content":{"rendered":"

>> GENERAL >>>>><\/strong><\/p>\n

– medium-sized raptor, roughly size of Common Buzzard<\/a> but slimmer
\n– diurnal migrant, active sea-crossing
\n– migrates singly, often flocks at migration bottlenecks<\/p>\n

>> VISUAL ID >>>>><\/strong><\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus aeruginosus harterti<\/em>, 1CY<\/strong>
\nBIF1900, 31\/12\/2012, Larache, Morroco, Mathias Putze
\n– typical harrier: wings held in `V\u00b4 when soaring
\n– JUV with unusally extensive creamy-yellow on forewing<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus aeruginosus harterti<\/em>, 1CY<\/strong>
\nBIF1901, 31\/12\/2012, Larache, Morroco, Mathias Putze
\n– same as BIF1900, aged as 1CY by one generation of remiges and very dark eye
\n– individual with unusally extensive creamy-yellow patches on breast and underwing<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, 1CY<\/strong>
\nBIF1902, 24\/07\/2013, Prignitz, Germany, Mathias Putze
\n– more typical JUV with uniformly dark brown body and underwings
\n– head with yellow-ochre crown and throat and brown eye-mask<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, 1CY<\/strong>
\nBIF1903, 18\/08\/2012, Havelland, Germany, Mathias Putze
\n– very dark JUV with diagnostic head-pattern
\n– upperwing with pale tips of greater and primary coverts
\n– note pale bases of primaries, shown by some individuals<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, 1CY<\/strong>
\nBIF1898, 28\/09\/2010, Ras Garib, Egypt, Michael Hei\u00df
\n– average juvenile in autumn, dark brown with rather slender wings with 5 long fingers and long tail<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD F<\/strong>
\nBIF1895, 08\/04\/2014, Leipzig, Germany, Mathias Putze
\n– typical AD F with dark brown body and diagnostic yellow-ochre head pattern
\n– aged as AD by rather light iris and irregular trailing edge to the wing (compare with 1CY in BIF1901)<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD F<\/strong>
\nBIF1894, 08\/04\/2014, Leipzig, Germany, Mathias Putze
\n– same as BIF1895, rusty tail and contrasting pale shoulder patches are typical F features<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus aeruginosus<\/em>, AD F<\/strong>
\nBIF1896, 08\/04\/2014, Leipzig, Germany, Mathias Putze
\n– same as BIF1894, some AD F in spring very chocolate brown and thus difficult to separate from 2CY
\n– aged as AD by good conditions of remiges and tail and pale iris<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD F<\/strong>
\nBIF1899, 25\/07\/2013, Prignitz, Germany, Mathias Putze
\n– active moult can cause an unusual silhouette
\n– note different generations of remiges, aging of such F is difficult<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD M<\/strong>
\nBIF1886, 29\/06\/2010, Kiskuns\u00e1gi, Hungary, Mathias Putze
\n– typical AD M with light underwings (including coverts and resolved trailing edge),\u00a0black hand
\n– streaked upper breast
\n– grey head with yellow iris<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD M<\/strong>
\nBIF1887, 08\/04\/2014, Leipzig, Germany, Mathias Putze
\n– AD M with completely brown body and and JUV-like head
\n– underwing coverts buffish, distictly barred brown
\n– grey secondaries und inner primaries with darker terminal band
\n-> could be mistaken for a very old F, but black fingers clearly indicate a male<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD M<\/strong>
\nBIF1890, 01\/05\/2013, Prignitz, Germany, Mathias Putze
\n– similar to M in BIF1887, distinct dusky trailing edge indicates younger AD<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD M<\/strong>
\nBIF1888, 08\/04\/2014, Leipzig, Germany, Mathias Putze
\n– sexed by grey tail and wing-pattern
\n– probably older AD due to unicoloured silvery-grey outer underwing coverts<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD M<\/strong>
\nBIF1889, 08\/04\/2014, Leipzig, Germany, Mathias Putze
\n– same as BIF1888, older AD uppersides strongly contrasting between brown body\/inner wing coverts and silver-grey remiges\/primary coverts and tail<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD M<\/strong>
\nBIF1891, 13\/06\/2013, Prignitz, Germany, Mathias Putze
\n– when seen shortly or at higher altitude could be mistaken as M Hen Harrier<\/a>, but note brown body<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD M<\/strong>
\nBIF1892, 08\/05\/2014, Demmin, Germany, Michael Hei\u00df<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, 2 AD M<\/strong>
\nBIF1906, 01\/05\/2013, Prignitz, Germany, Mathias Putze
\n– right bird straightforward identified as AD M
\n– the left bird could easily be mistaken as F but note greyish tail<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus<\/em>, AD M F<\/strong>
\nBIF1907, 01\/05\/2013, Prignitz, Germany, Mathias Putze
\n– same as in BIF1906, from below both birds easily identified as M
\n– upper bird with typical dark trailing edge of younger males<\/p>\n

\"\"<\/a>
\nWestern Marsh Harrier Circus a. aeruginosus\u00a0<\/em> (right)<\/strong>
\nShort-eared Owl Asio f. flammeus<\/em><\/strong>
\nBIF1256, 23\/09\/2016, Besh Barmag, Azerbaijan, Michael Hei\u00df
\n– typical silhouette of a high circling bird<\/p>\n

>> ACOUSTIC ID >>>>><\/strong><\/p>\n

– usually nonvocal during migration<\/p>\n

>> COMPARISON SPECIES >>>>><\/strong><\/p>\n

Booted Eagle<\/a> (v)
\nCommon Buzzard<\/a> (v)
\nBlack Kite<\/a> (v)
\nEastern Marsh Harrier (v)
\nHen Harrier<\/a> (v)<\/p>\n

#raptor #birdofprey #birdsofprey #soaringbird<\/p>\n

#ornithology #birdmigration #birdID #birdguide #birding #birdwatching #birdsound #westernpalearctic #europe #vismig #flightcalls #middleeast #northernafrica #workinprogress<\/p>\n","protected":false},"excerpt":{"rendered":"

>> GENERAL >>>>> – medium-sized raptor, roughly size of Common Buzzard but slimmer – diurnal migrant, active sea-crossing – migrates singly, often flocks at migration bottlenecks >> VISUAL ID >>>>> Western Marsh Harrier Circus aeruginosus harterti, 1CY BIF1900, 31\/12\/2012, Larache, Morroco, Mathias Putze – typical harrier: wings held in `V\u00b4 when soaring – JUV with … Continue reading Western Marsh Harrier
Circus aeruginosus<\/em><\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":7402,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[202],"tags":[250],"class_list":["post-7382","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-acciptridae","tag-western-marsh-harrier-circus-aeruginosus"],"_links":{"self":[{"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=\/wp\/v2\/posts\/7382","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7382"}],"version-history":[{"count":17,"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=\/wp\/v2\/posts\/7382\/revisions"}],"predecessor-version":[{"id":11595,"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=\/wp\/v2\/posts\/7382\/revisions\/11595"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=\/wp\/v2\/media\/7402"}],"wp:attachment":[{"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7382"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7382"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/birds-in-flight.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}