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First Record of Dark‐sided Flycatcher (Muscicapa sibirica) for Temperate North America: Intercontinental Vagrancy and Migratory Misorientation.

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Title: First Record of Dark‐sided Flycatcher (Muscicapa sibirica) for Temperate North America: Intercontinental Vagrancy and Migratory Misorientation.
Authors: Freeland, Martin B. H.1,2 (AUTHOR) martinf3@stanford.edu, Meier, Eve3 (AUTHOR), Lynch, Patricia3 (AUTHOR), Dunn, Jon L.2 (AUTHOR), Pyle, Peter2,4 (AUTHOR), Henry, Chris P.3 (AUTHOR), Xu, Maya E.1 (AUTHOR), Dirzo, Rodolfo1,5,6 (AUTHOR)
Source: Ecology & Evolution (20457758). Apr2026, Vol. 16 Issue 4, p1-9. 9p.
Subject Terms: *Bird migration, *Temperate climate, *Migratory animals
Geographic Terms: California, Asia, East Asia, North America
Abstract: Birds are among the most mobile organisms on the planet: many species routinely perform long‐distance migrations that require remarkable feats of physical endurance and complex navigation. Rarely, individual long‐distance migrants may make movements in exceptional directions, placing them beyond their species' ordinary distributions and providing the potential for significant ecological developments, such as the colonization of a new region by the vagrant species, the introduction of novel parasites or pathogens, or the dispersal of seeds and fungal spores. We detail the occurrence of a Dark‐sided Flycatcher (Muscicapa sibirica), a highly migratory passerine species typically found in East Asia, at an urban site in California on 17–19 September 2025, establishing the first record of this species and genus for temperate North America. We age this individual as a first‐fall bird and discuss molt strategies in the genus Muscicapa. We identify it as a member of the nominate subspecies, therefore likely originating from highly migratory populations that breed in northeast Asia. We evaluate mechanisms by which this individual may have arrived in California and discuss the concepts of reversal and mirror‐image misorientation, modes of anomalous navigation that may provide explanations for Palearctic‐Nearctic vagrancy in highly migratory Asian passerines. Our observation represents a noteworthy addition to the known avifauna of temperate North America. In documenting this occurrence, we draw attention to the remarkable but little‐studied process of long‐distance vagrancy in migratory birds. [ABSTRACT FROM AUTHOR]
Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: First Record of Dark‐sided Flycatcher (Muscicapa sibirica) for Temperate North America: Intercontinental Vagrancy and Migratory Misorientation.
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  Data: <searchLink fieldCode="AR" term="%22Freeland%2C+Martin+B%2E+H%2E%22">Freeland, Martin B. H.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> martinf3@stanford.edu</i><br /><searchLink fieldCode="AR" term="%22Meier%2C+Eve%22">Meier, Eve</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lynch%2C+Patricia%22">Lynch, Patricia</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dunn%2C+Jon+L%2E%22">Dunn, Jon L.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pyle%2C+Peter%22">Pyle, Peter</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Henry%2C+Chris+P%2E%22">Henry, Chris P.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xu%2C+Maya+E%2E%22">Xu, Maya E.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dirzo%2C+Rodolfo%22">Dirzo, Rodolfo</searchLink><relatesTo>1,5,6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ecology+%26+Evolution+%2820457758%29%22">Ecology & Evolution (20457758)</searchLink>. Apr2026, Vol. 16 Issue 4, p1-9. 9p.
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  Data: *<searchLink fieldCode="DE" term="%22Bird+migration%22">Bird migration</searchLink><br />*<searchLink fieldCode="DE" term="%22Temperate+climate%22">Temperate climate</searchLink><br />*<searchLink fieldCode="DE" term="%22Migratory+animals%22">Migratory animals</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22California%22">California</searchLink><br /><searchLink fieldCode="DE" term="%22Asia%22">Asia</searchLink><br /><searchLink fieldCode="DE" term="%22East+Asia%22">East Asia</searchLink><br /><searchLink fieldCode="DE" term="%22North+America%22">North America</searchLink>
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  Data: Birds are among the most mobile organisms on the planet: many species routinely perform long‐distance migrations that require remarkable feats of physical endurance and complex navigation. Rarely, individual long‐distance migrants may make movements in exceptional directions, placing them beyond their species' ordinary distributions and providing the potential for significant ecological developments, such as the colonization of a new region by the vagrant species, the introduction of novel parasites or pathogens, or the dispersal of seeds and fungal spores. We detail the occurrence of a Dark‐sided Flycatcher (Muscicapa sibirica), a highly migratory passerine species typically found in East Asia, at an urban site in California on 17–19 September 2025, establishing the first record of this species and genus for temperate North America. We age this individual as a first‐fall bird and discuss molt strategies in the genus Muscicapa. We identify it as a member of the nominate subspecies, therefore likely originating from highly migratory populations that breed in northeast Asia. We evaluate mechanisms by which this individual may have arrived in California and discuss the concepts of reversal and mirror‐image misorientation, modes of anomalous navigation that may provide explanations for Palearctic‐Nearctic vagrancy in highly migratory Asian passerines. Our observation represents a noteworthy addition to the known avifauna of temperate North America. In documenting this occurrence, we draw attention to the remarkable but little‐studied process of long‐distance vagrancy in migratory birds. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/ece3.73445
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        Text: English
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      – SubjectFull: Bird migration
        Type: general
      – SubjectFull: Temperate climate
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      – SubjectFull: Migratory animals
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      – SubjectFull: California
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      – SubjectFull: Asia
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      – SubjectFull: East Asia
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      – SubjectFull: North America
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              Text: Apr2026
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