{"id":2864,"date":"2016-07-04T22:21:06","date_gmt":"2016-07-04T22:21:06","guid":{"rendered":"https:\/\/eontbird.ca\/?p=2864"},"modified":"2018-02-21T23:32:37","modified_gmt":"2018-02-21T23:32:37","slug":"differential-migration-of-least-flycatchers-in-fall","status":"publish","type":"post","link":"https:\/\/eontbird.ca\/?p=2864","title":{"rendered":"Differential Migration of Least Flycatchers in Fall"},"content":{"rendered":"<p>Differential Migration is a fascinating subject and is appreciable by observing the migration of Least Flycatchers. Migrant adults precede immature birds by about a month (Hussell et al. 1967).<!--more--> Over a three year study period conducted at Long Point Bird Observatory from 1966-1968, 90% of adult Least Flycatchers occurred between 11 July and 13 August. Peak migration of immatures occurred during the last days of<span class=\"text_exposed_show\"> August. Incredibly, peak migration of immatures averaged 38 days later than adults during the 1966-1968 study period (Hussell 1981). Ratty and faded adults present little identification challenge to those relatively well-versed in Empidonax ID, but immatures are a whole other story. &#8220;Vested&#8221; undersides with greenish-brown to the flanks and creamy yellow tones to the belly; rich tones throughout the upperside; and, in some cases, these features are in concert with a rather full, almond-shaped eyering. Add a cascade of sunlight piercing through the canopy above, and you have yourself a Yellow-bellied Flycatcher \ud83d\ude09<\/span><\/p>\n<div class=\"text_exposed_show\">\n<p><a href=\"https:\/\/eontbird.ca\/wp-content\/uploads\/2016\/07\/021-800x391.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-2867 aligncenter\" src=\"https:\/\/eontbird.ca\/wp-content\/uploads\/2016\/07\/021-800x391-300x147.jpg\" alt=\"021-800x391\" width=\"300\" height=\"147\" srcset=\"https:\/\/eontbird.ca\/wp-content\/uploads\/2016\/07\/021-800x391-300x147.jpg 300w, https:\/\/eontbird.ca\/wp-content\/uploads\/2016\/07\/021-800x391-768x375.jpg 768w, https:\/\/eontbird.ca\/wp-content\/uploads\/2016\/07\/021-800x391.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><strong>Photo:<\/strong> A first basic (immature) Least Flycatcher. Shirleys Bay, Ottawa, Ontario. 4 September 2015.<\/p>\n<p style=\"text-align: center;\"><strong>References<\/strong><\/p>\n<p style=\"text-align: left;\">Hussell, D.J.T., T. Davis and R.D. Montgomerie. 1967. Differential migration of adult and immature Least Flycatchers. <em>Birding-Banding<\/em> 38:61-66. <a href=\"https:\/\/sora.unm.edu\/sites\/default\/files\/journals\/jfo\/v038n01\/p0061-p0066.pdf\" rel=\"noopener\">https:\/\/sora.unm.edu\/sites\/default\/files\/journals\/jfo\/v038n01\/p0061-p0066.pdf<\/a><\/p>\n<p style=\"text-align: left;\">Hussell, D.J.T. 1981. Migrations of the Least Flycatcher in southern Ontario.\u00a0<em>Journal of Field Ornithology <\/em>52: 97-111. <a href=\"https:\/\/sora.unm.edu\/sites\/default\/files\/journals\/jfo\/v052n02\/p0097-p0111.pdf\" rel=\"noopener\">https:\/\/sora.unm.edu\/sites\/default\/files\/journals\/jfo\/v052n02\/p0097-p0111.pdf<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Differential Migration is a fascinating subject and is appreciable by observing the migration of Least Flycatchers. Migrant adults precede immature birds by about a month (Hussell et al. 1967).<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2864","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/eontbird.ca\/index.php?rest_route=\/wp\/v2\/posts\/2864","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eontbird.ca\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eontbird.ca\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eontbird.ca\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eontbird.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2864"}],"version-history":[{"count":8,"href":"https:\/\/eontbird.ca\/index.php?rest_route=\/wp\/v2\/posts\/2864\/revisions"}],"predecessor-version":[{"id":8400,"href":"https:\/\/eontbird.ca\/index.php?rest_route=\/wp\/v2\/posts\/2864\/revisions\/8400"}],"wp:attachment":[{"href":"https:\/\/eontbird.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2864"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eontbird.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2864"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eontbird.ca\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2864"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}