{"id":3390,"date":"2019-01-09T17:40:54","date_gmt":"2019-01-09T22:40:54","guid":{"rendered":"https:\/\/www.birds.cornell.edu\/home\/?p=3390"},"modified":"2022-02-10T10:13:20","modified_gmt":"2022-02-10T15:13:20","slug":"science-to-action-california-protects-tricolored-blackbird-after-ebird-data-help-show-34-decline","status":"publish","type":"post","link":"https:\/\/www.birds.cornell.edu\/home\/science-to-action-california-protects-tricolored-blackbird-after-ebird-data-help-show-34-decline\/","title":{"rendered":"California Protects Tricolored Blackbird After eBird Data Help Show 34% Decline"},"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\/guide\/Tricolored_Blackbird\/overview\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/TCBlackbird-Voaden-ML46575431-1.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/TCBlackbird-Voaden-ML46575431-1-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/TCBlackbird-Voaden-ML46575431-1-768x576.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/TCBlackbird-Voaden-ML46575431-1-480x360.jpg 480w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/01\/TCBlackbird-Voaden-ML46575431-1.jpg 832w\" sizes=\"\" alt=\"Tricolored Blackbird with insect in its beak taking off\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\"><\/span><a class=\"article-item-link\" href=\"https:\/\/www.allaboutbirds.org\/guide\/Tricolored_Blackbird\/overview\"><span class=\"article-item-header\">Online Bird Guide: Tricolored Blackbirds<\/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\/californias-tricolored-blackbird-is-running-out-of-room\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/04\/TCBlackbird-homepage-Kramer.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/04\/TCBlackbird-homepage-Kramer.jpg 609w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2019\/04\/TCBlackbird-homepage-Kramer-480x360.jpg 480w\" sizes=\"\" alt=\"Tricolored Blackbird by Gary Kramer\" loading=\"lazy\" \/><\/figure><\/div><div class=\"article-item-body\"><span class=\"attribution top\"><\/span><a class=\"article-item-link\" href=\"https:\/\/www.allaboutbirds.org\/californias-tricolored-blackbird-is-running-out-of-room\/\"><span class=\"article-item-header\">California\u2019s Tricolored Blackbird Is Running Out of Room<\/span><\/a><\/div><\/div><\/li><\/ul><\/div>\n\n\n<h2 class=\"wp-block-heading\">Citation<\/h2>\n\n\n\n<p>Robinson, O. J. et al. 2018.&nbsp;Using citizen-science data in integrated population models to inform conservation. Biological Conservation 227:361-368.&nbsp;<a href=\"https:\/\/doi.org\/10.1016\/j.biocon.2018.10.002\">https:\/\/doi.org\/10.1016\/j.biocon.2018.10.002<\/a><\/p>\n<\/div>\n\n\n\n<p>They might nest by the thousands in a Central California field one year, then be gone the next. Tricolored Blackbird colonies move unpredictably from year to year, making them notoriously difficult to census. Despite apparent population declines, scientists couldn\u2019t convince California officials that Tricolored Blackbirds needed the state\u2019s protection.<\/p>\n\n\n\n<p>Cornell Lab of Ornithology researcher Orin Robinson and colleagues helped change minds when they developed a new way of estimating population trends for the species using data contributed to eBird by citizen-science participants, as well as from other biological surveys. Their analysis suggests that Tricolored Blackbird experienced a precipitous 34% decline in the past 10 years. These results spurred the State of California to approve state Endangered Species Act protections for Tricolored Blackbirds in April 2018.<\/p>\n\n\n\n<p>Your donations help support breakthroughs like these\u2014using sound science to inform bird conservation\u2014enabling action before it\u2019s too late.<\/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 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 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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 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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 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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, 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top\">Conservation in Action<\/span><a class=\"article-item-link\" href=\"https:\/\/www.birds.cornell.edu\/home\/if-this-reef-could-talk\/\"><span class=\"article-item-header\">If This Reef Could Talk<\/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\/free-k-12-lessons-open-doors-for-kids-to-explore-nature-and-science\/\"><figure class=\"article-item-media-ratio\"><img decoding=\"async\" src=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2020\/02\/K12Explorers.jpg\" srcset=\"https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2020\/02\/K12Explorers-720x540.jpg 720w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2020\/02\/K12Explorers-768x576.jpg 768w, https:\/\/www.birds.cornell.edu\/home\/wp-content\/uploads\/2020\/02\/K12Explorers-480x360.jpg 480w, 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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\" 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J. et al. 2018.&nbsp;Using citizen-science data in integrated population models to inform conservation. Biological Conservation 227:361-368.&nbsp;https:\/\/doi.org\/10.1016\/j.biocon.2018.10.002 They might nest by the thousands in<a class=\"excerpt-read-more\" href=\"https:\/\/www.birds.cornell.edu\/home\/science-to-action-california-protects-tricolored-blackbird-after-ebird-data-help-show-34-decline\/\" title=\"ReadCalifornia Protects Tricolored Blackbird After eBird Data Help Show 34% Decline\">&#8230; Read more 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