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May 22, 2026Japanese Journal of Ornithology

Mass mortality of Warbling White-eyes Zosterops japonicus: Findings from necropsy and site investigation in Niigata, Japan

Yuko SATO Nana Ushine Mika OKAMOTO Kunihide SUZUKI

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Key Points

To investigate the cause of mass mortality in warbling white-eyes through necropsy and site investigation.
Investigated mortality incidents of 15 warbling white-eyes from January 5 to January 10, 2024.
Conducted necropsy on 9 birds after confirming avian influenza negativity.
Observed external and internal injuries, and assessed nutritional status based on fat and muscle mass.
Identified multiple instances of internal bleeding in the skull and lungs during necropsy.
No nutritional deficiency was found; birds had been foraging prior to death.
Concluded that collisions with glass windows were the likely cause of mortality.

Implication

Necropsy findings reveal glass collision as the cause of warbling white-eyes mortality in Niigata, highlighting collision prevention's importance.

Abstract

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Cite This Study

SATO et al. (2026) studied this question.

synapsesocial.com/papers/6a34dc5265a5b0777af2c8b8 https://doi.org/10.3838/jjo.75.111

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