Colour-Banded Eider Linked Nunavut and Iceland More Than 2,800 Kilometres Apart
A male northern common eider banded on East Bay Island, Nunavut, in 2023 was filmed in western Iceland…
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News about Common Eider
Research, conservation and important developments connected to this species.
Only About Half of American Common Eider Females Were Estimated to Breed in a Given Year
Satellite tracking of 123 females across Maine and eastern Canada estimated overall breeding propensity at 53%, while regional…
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Record 30 Polar-Bear Days on Kongsfjorden’s Eider Islands in One Month
Researchers recorded a record 30 polar-bear days on Kongsfjorden’s eider islands from 4 June to 4 July 2026.…
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Danish Common Eider Sex-Ratio Survey Recorded 63.3% Males, Down From 69.3% in 2024
A Danish survey analysed 22,090 Common Eiders at 58 coastal locations in March 2026. Males made up 63.3%,…
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Female Common Eiders in the High-predation Colony Had Higher Baseline Corticosterone and T3
In two Finnish common-eider colonies, females under high eagle predation had higher baseline corticosterone and T3, while females…
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Previous H5 Exposure Was Far More Common in Arctic Eider Females in 2023–24 Than in 2019
Archived plasma from Arctic-breeding common eider females showed H5 antibodies in 23% of birds sampled in 2019, compared…
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Kongsfjorden Eider Breeding Population Has Remained Below 3,000 Pairs in Recent Years
Norwegian Polar Institute monitoring updated in May 2026 shows that the common eider breeding population in Kongsfjorden has…
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Higher PFOS Was Linked to Lower Egg Temperatures in Finnish Common Eiders
Researchers studied 18 female common goldeneyes and 37 female common eiders in Finland. Higher PFOS was linked to…
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Under High Predation Risk, Large-Headed Eider Females Bred Later Than Small-Headed Females
A 2026 Finnish study of 1,461 eider breeding attempts found that high predation risk widened differences in laying…
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Eight Diving Waterfowl Shared Genomic Signatures Linked to Underwater Foraging
A 2026 comparison of 25 waterfowl genomes found repeated positive-selection signals and shared amino-acid changes across eight diving…
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AI-assisted Eider Counting Cut Annotation Time by 87.5% in Arctic Aerial Surveys
A human-in-the-loop system for Arctic eider aerial surveys reduced average image-annotation time from 117.1 to 14.7 minutes, an…
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Genome Assemblies Released for 73 Anseriformes Species
A 2026 data paper released whole-genome assemblies for 73 species of ducks, geese, swans and other Anseriformes. Each…
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Wintering Male Northern Common Eiders Fell 29% Between 2018 and 2023
Canada’s 2025 status report, released in 2026, estimated 121,000 wintering adult male northern common eiders in 2023—29% fewer…
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A 1,200-Year Record Shows an Unprecedented Modern Decline at One Arctic Eider Colony
Peat and lake sediments from a northern common eider colony in Digges Sound, northeastern Hudson Bay, indicate that…
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Common Eider Females Moved Farther and Switched Islands More Often After Nest Failure and High Local Nest Predation
A 21-year study in the Tvärminne archipelago, southwestern Finland, found that female common eiders moved farther after nest…
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