{"id":2437,"date":"2018-11-27T15:05:44","date_gmt":"2018-11-27T20:05:44","guid":{"rendered":"https:\/\/www.birds.cornell.edu\/home\/?p=2437"},"modified":"2022-01-24T12:16:53","modified_gmt":"2022-01-24T17:16:53","slug":"new-breakthroughs-in-radar-science-reveal-4-billion-birds-on-the-move","status":"publish","type":"post","link":"https:\/\/www.birds.cornell.edu\/home\/new-breakthroughs-in-radar-science-reveal-4-billion-birds-on-the-move\/","title":{"rendered":"Breakthroughs in Radar Science Reveal 4 Billion Birds On The Move"},"content":{"rendered":"\n<div class=\"wp-block-group sidebar-alignright has-lightgray-background-color has-background order-third is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading\">MORE ABOUT THIS TOPIC<\/h2>\n\n\n<div class=\"article-list list-style card-four \"><ul><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.allaboutbirds.org\/4-billion-birds-will-fly-through-american-airspace-this-fall\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/WThrush-Spencer-Impact-1280x960.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/WThrush-Spencer-Impact-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/WThrush-Spencer-Impact-768x576.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/WThrush-Spencer-Impact-1280x960.jpg 1280w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/WThrush-Spencer-Impact-480x360.jpg 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/WThrush-Spencer-Impact.jpg 1300w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" alt=\"Wood Thrush by Andrew Spencer\/ML\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><a class=\"article-item-link\" href=\"https:\/\/www.allaboutbirds.org\/4-billion-birds-will-fly-through-american-airspace-this-fall\/\"><span class=\"article-item-header\">4 Billion Birds Will Fly Through American Airspace This Fall<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.allaboutbirds.org\/can-you-really-use-weather-radar-to-see-migrating-birds\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/radar-migration-Impact.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/radar-migration-Impact.jpg 540w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/radar-migration-Impact-480x360.jpg 480w\" sizes=\"\" alt=\"Nexrad radar mosaic showing bird migration, 8 May 2009.\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><a class=\"article-item-link\" href=\"https:\/\/www.allaboutbirds.org\/can-you-really-use-weather-radar-to-see-migrating-birds\/\"><span class=\"article-item-header\">Can you really use weather radar to see migrating birds?<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"http:\/\/birdcast.info\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Birdcast-Impact.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Birdcast-Impact-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Birdcast-Impact-768x576.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Birdcast-Impact-480x360.jpg 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Birdcast-Impact.jpg 1022w\" sizes=\"\" alt=\"Birdcast forecast\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><a class=\"article-item-link\" href=\"http:\/\/birdcast.info\/\"><span class=\"article-item-header\">BirdCast Website: Migration Forecasts<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.allaboutbirds.org\/the-new-migration-science\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Chat-Johnson-Impact.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Chat-Johnson-Impact-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Chat-Johnson-Impact-768x576.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Chat-Johnson-Impact-480x360.jpg 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2018\/11\/Chat-Johnson-Impact.jpg 1022w\" sizes=\"\" alt=\"This Yellow-breasted Chat made a migratory rest stop on a ship\u2019s compass in the Atlantic Ocean. Photo by Tom Johnson\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><a class=\"article-item-link\" href=\"https:\/\/www.allaboutbirds.org\/the-new-migration-science\/\"><span class=\"article-item-header\">The New Migration Science<\/span><\/a><\/div><\/div><\/li><\/ul><\/div><\/div>\n\n\n\n<p>Fall migration will bring 4 billion birds into the skies over the United States. That\u2019s not a guess\u2014it\u2019s hard data, gleaned from the first-ever national bird count using weather radar.<\/p>\n\n\n\n<p>Cornell Lab of Ornithology scientists analyzed data from 143 weather radar stations from 2013 to 2017 to provide the first large-scale counts of migratory bird activity across the United States. By comparing the number of birds moving back and forth each autumn and spring, researchers also determined the average annual return rate: 76% for birds crossing the southern U.S. border, including Neotropical migrants such as warblers, tanagers, and orioles.<\/p>\n\n\n\n<p>Your support of the Cornell Lab helps advance a whole new era of big-data ornithology as scientists use novel ways to combine radar technology and computational power to illuminate the scale of bird migration across the continents.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-red-background-color has-background wp-element-button\" href=\"https:\/\/give.birds.cornell.edu\/page\/87895\/donate\/1?ea.tracking.id=WXXXXX01C\">Donate to Help<\/a><\/div>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-sky-blue-neutral-background-color has-background negative-margin-bottom order-bottom is-layout-flow wp-block-group-is-layout-flow\" id=\"more-impact-stories\">\n<h2 class=\"wp-block-heading has-text-align-center\">More Stories<\/h2>\n\n\n<div class=\"article-list card-display carousel card-three \"><ul><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.birds.cornell.edu\/home\/safeguarding-our-shared-birds\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/11\/56732651-1-1280x853.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/11\/56732651-1-720x480.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/11\/56732651-1-1280x853.jpg 1280w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/11\/56732651-1-768x512.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/11\/56732651-1-1536x1024.jpg 1536w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/11\/56732651-1-2048x1365.jpg 2048w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/11\/56732651-1-480x320.jpg 480w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" alt=\"Wood Thrush standing on a branch singing.\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\">Conservation Media<\/span><a class=\"article-item-link\" href=\"https:\/\/www.birds.cornell.edu\/home\/safeguarding-our-shared-birds\/\"><span class=\"article-item-header\">Safeguarding the Songs of Spring: The Outsize Value of the Five Great Forests<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.birds.cornell.edu\/home\/powering-a-new-era-of-conservation\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/redhead-isaac-polanski-616924799-1.33-1200.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/redhead-isaac-polanski-616924799-1.33-1200-720x541.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/redhead-isaac-polanski-616924799-1.33-1200-240x180.jpg 240w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/redhead-isaac-polanski-616924799-1.33-1200-768x577.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/redhead-isaac-polanski-616924799-1.33-1200-480x360.jpg 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/redhead-isaac-polanski-616924799-1.33-1200.jpg 1200w\" sizes=\"\" alt=\"closeup of a duck with a cinnamon red head and black-and-white body\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\">Conservation Science<\/span><a class=\"article-item-link\" href=\"https:\/\/www.birds.cornell.edu\/home\/powering-a-new-era-of-conservation\/\"><span class=\"article-item-header\">Powering a New Era of Conservation<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.birds.cornell.edu\/home\/any-person-any-study-any-vision\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/annual-any-person-feature-1.33.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/annual-any-person-feature-1.33-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/annual-any-person-feature-1.33-240x180.jpg 240w, 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class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/annual-report-inspiration-1.33.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/annual-report-inspiration-1.33-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/annual-report-inspiration-1.33-240x180.jpg 240w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/annual-report-inspiration-1.33-768x576.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/annual-report-inspiration-1.33-480x360.jpg 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/annual-report-inspiration-1.33.jpg 1220w\" sizes=\"\" alt=\"people working on an open structure out at sea, with boats moored alongside\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\">K\u201312 Education<\/span><a class=\"article-item-link\" href=\"https:\/\/www.birds.cornell.edu\/home\/inspiration-and-activation\/\"><span class=\"article-item-header\">Inspiration and Activation<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.birds.cornell.edu\/home\/the-magic-of-merlin\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/merlin-annual-report-fi-1.33.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/merlin-annual-report-fi-1.33-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/merlin-annual-report-fi-1.33-240x180.jpg 240w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/merlin-annual-report-fi-1.33-768x576.jpg 768w, 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src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/blue-winged-teal-matt-zuro-min.png\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/blue-winged-teal-matt-zuro-min-720x480.png 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/blue-winged-teal-matt-zuro-min-768x512.png 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/blue-winged-teal-matt-zuro-min-480x320.png 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2025\/09\/blue-winged-teal-matt-zuro-min.png 1000w\" sizes=\"\" alt=\"blue-winged teal in flight\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\">Bird Academy<\/span><a class=\"article-item-link\" href=\"https:\/\/www.birds.cornell.edu\/home\/a-conversation-with-our-director\/\"><span class=\"article-item-header\">A Conversation with Our Director<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.birds.cornell.edu\/home\/revitalizing-the-pacific-flyway\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/11955171-Semipalmated_Ploverimpact-FI-John_van_Dort.png\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/11955171-Semipalmated_Ploverimpact-FI-John_van_Dort-720x540.png 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/11955171-Semipalmated_Ploverimpact-FI-John_van_Dort-240x180.png 240w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/11955171-Semipalmated_Ploverimpact-FI-John_van_Dort-768x576.png 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/11955171-Semipalmated_Ploverimpact-FI-John_van_Dort-480x360.png 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/11955171-Semipalmated_Ploverimpact-FI-John_van_Dort.png 1079w\" sizes=\"\" alt=\"Small, white and dark brown birds fly and flock along a shoreline.\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\">Coastal Solutions<\/span><a class=\"article-item-link\" href=\"https:\/\/www.birds.cornell.edu\/home\/revitalizing-the-pacific-flyway\/\"><span class=\"article-item-header\">Revitalizing the Pacific Flyway<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.birds.cornell.edu\/home\/americas-imperiled-arctic-wilderness\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/Yellow-billed_Loon-chick-Impact-FI-Gerrit_Vyn.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/Yellow-billed_Loon-chick-Impact-FI-Gerrit_Vyn-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/Yellow-billed_Loon-chick-Impact-FI-Gerrit_Vyn-240x180.jpg 240w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/Yellow-billed_Loon-chick-Impact-FI-Gerrit_Vyn-768x576.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/Yellow-billed_Loon-chick-Impact-FI-Gerrit_Vyn-480x360.jpg 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/Yellow-billed_Loon-chick-Impact-FI-Gerrit_Vyn.jpg 1079w\" sizes=\"\" alt=\"Black-and-white bird with a big yellow bill sits in the grass.\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\">Conservation Media<\/span><a class=\"article-item-link\" href=\"https:\/\/www.birds.cornell.edu\/home\/americas-imperiled-arctic-wilderness\/\"><span class=\"article-item-header\">America\u2019s Imperiled Arctic Wilderness<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.birds.cornell.edu\/home\/if-this-reef-could-talk\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/FI-impact-Coral_reef-Adobe.png\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/FI-impact-Coral_reef-Adobe-720x540.png 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/FI-impact-Coral_reef-Adobe-240x180.png 240w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2024\/10\/FI-impact-Coral_reef-Adobe-768x576.png 768w, 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Science<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.birds.cornell.edu\/home\/how-we-use-sound-to-help-protect-elephants-from-poaching-2\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/ELP-maleportrait.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/ELP-maleportrait-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/ELP-maleportrait-480x360.jpg 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/ELP-maleportrait.jpg 751w\" sizes=\"\" alt=\"close up of an elephant's face\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\">Conservation in Action<\/span><a class=\"article-item-link\" href=\"https:\/\/www.birds.cornell.edu\/home\/how-we-use-sound-to-help-protect-elephants-from-poaching-2\/\"><span class=\"article-item-header\">How We Use Sound to Help Protect Elephants from Poaching<\/span><\/a><\/div><\/div><\/li><li class=\"article-item\"><div class=\"article-item-container\"><div class=\"article-item-media content-article\" data-link-to=\"https:\/\/www.birds.cornell.edu\/home\/expanding-to-three-continents-merlin-bird-id-app-can-now-identify-3000-bird-species\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/Merlin-FI-colorscreen.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/Merlin-FI-colorscreen-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/Merlin-FI-colorscreen-768x576.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/Merlin-FI-colorscreen-480x360.jpg 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/Merlin-FI-colorscreen.jpg 1079w\" sizes=\"\" alt=\"yellow and black streaked bird singing, phone with merlin app\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\">Lifelong Learning<\/span><a class=\"article-item-link\" href=\"https:\/\/www.birds.cornell.edu\/home\/expanding-to-three-continents-merlin-bird-id-app-can-now-identify-3000-bird-species\/\"><span class=\"article-item-header\">Available on Six Continents, Merlin Bird ID Can Now Identify 6,000+ Bird Species<\/span><\/a><\/div><\/div><\/li><\/ul><\/div>\n\n\n<p><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>MORE ABOUT THIS TOPIC Fall migration will bring 4 billion birds into the skies over the United States. 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