Common Tern Eggs Had More PCBs, HCB and Mercury Than Oystercatcher Eggs in 40-Year Wadden Sea Study
Monitoring from 1981–2023 found higher PCB, HCB and mercury levels in common tern eggs than in Eurasian oystercatcher…
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Research, conservation and new discoveries
A continuing selection of new studies, conservation projects and important developments connected to species in the archive.
Estimated Great Cormorant Predation Reached 52–88% in Tagged Cod and 14–84% in Tagged Flounder
In Genner Bay, Denmark, a PIT-tag study estimated that great cormorants consumed 52–88% of tagged cod and 14–84%…
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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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Forest Disturbance Increased Modelled Habitat Suitability for Four European Herbivores
Tracking data from 3,069 animals showed that forest disturbance generally increased modelled relative habitat suitability for moose, red…
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Denmark Counted a Record 1,526 Great Egrets in October 2024 as Breeding Population Reached 93 Pairs
A 2026 national analysis found a record 1,526 great egrets in Denmark in October 2024 and 93 breeding…
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East Greenland Barnacle Geese Fell to 65,516 While the Russian Flyway Held Near 1.5 Million
AEWA’s 2026 assessment estimated 65,516 East Greenland barnacle geese in March 2026, down from earlier peaks of 80,000,…
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North-west European Greylag Goose Winter Population Estimated at 802,320
The north-west European greylag goose population was estimated at 802,320 wintering birds in January 2025, well above the…
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European Honey-buzzards Tracked from Germany Used Flexible Routes to Africa
Satellite tracking of 12 adult European honey-buzzards breeding in Germany documented routes to wintering areas from Liberia and…
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22 of 24 Annual-Cycle Measures Were Repeatable in GPS-Tracked Eurasian Curlews
A long-term GPS dataset of 94 adult Eurasian Curlews found statistically supported repeatability in 22 of 24 annual-cycle…
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Fallow Deer and Mouflon Shared 69% of Plant Genera in Their Æbelø Diets
Year-round DNA metabarcoding on the Danish island Æbelø found strongly overlapping diets in fallow deer and mouflon, with…
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Cormorant and Large-Gull Counts Fell at a Danish Pound Net, but the Difference Disappeared Within Weeks
At one Danish pound net fitted with Looming-Eye Buoys, great cormorant and large-gull counts dropped sharply relative to…
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Thrush Nightingales Crossed Deserts by Flying at Night and Remaining Almost Inactive by Day
Multisensor loggers showed that thrush nightingales crossed the Sahara and Arabian Desert through consecutive nocturnal flights, with daytime…
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Intermediate-Coloured Buzzards Increased Across Europe as Dark and Light Extremes Declined
A dataset of 99,343 citizen-science observations revealed strong geographic structure in common buzzard plumage across Europe; after pre-2000…
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X-rays Found Embedded Shotgun Pellets in 17% of Northwestern European Waterfowl
X-rays of 3,843 waterfowl from nine species in six northwestern European countries found embedded shotgun pellets in 17%…
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Two Models Estimated 13.5–19.6 Million Wild Boar Across Europe’s Core Range
Two independently calibrated models estimated about 13.5 million and 19.6 million wild boar across Europe’s core range before…
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New H5N1 Genotype Killed at Least 3,000 Danish Black-Headed Gulls
A gull-associated H5N1 genotype caused the deaths of at least 3,000 adult black-headed gulls in Denmark after a…
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Breeding Pied Avocets Continued to Decline in the Wadden Sea
A trilateral report classified the Wadden Sea breeding trend as a moderate decline for both 1991–2023 and the…
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European Roe Deer Shifted Between Forest and Open Ground as Risks Changed
Tracking 412 European roe deer showed that habitat selection changed strongly with time of day and season, while…
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Denmark’s First Detected Usutu Virus Outbreak Primarily Affected Eurasian Blackbirds
Denmark’s first detected Usutu virus outbreak in 2024 included 56 positive Eurasian blackbirds among 85 examined, plus two…
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