Urban Bird Diversity Was More Strongly Linked to Forest Structure Than the Surrounding City
Across 12 urban forests in three Italian cities, researchers recorded 2,035 birds from 52 species. Local forest structure…
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News about Eurasian Blue Tit
Research, conservation and important developments connected to this species.
Record May Heatwave Reduced Breeding Success and Nestling Mass in Great Tits and Eurasian Blue Tits
Compared with equivalent parts of the breeding season in 1978–2025, fledgling number declined by 4.5 nestlings in 2026…
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Autumn Movement Timing Stayed Stable as Wings Became Rounder in Great and Eurasian Blue Tits
Hungarian ringing data from 2004–2024 found stable autumn movement timing in great and Eurasian blue tits, while body…
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Great Tit and Eurasian Blue Tit Eggs Contained Different Mixes of PFOS Isomers
Researchers analysed 41 eggs from a contaminated industrial site in Belgium and detected both linear and branched PFAS…
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Higher Temperature and Humidity Reshaped Microbial Communities in Eurasian Blue Tit Nests
An experiment in nine Eurasian blue tit nest boxes in Valsaín, Spain, found that higher temperature and humidity…
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Mean Eurasian Blue Tit Winter Count Rose Fourfold in Finnish Urban Survey Plots
Across 31 Finnish settlements, mean Eurasian blue tit counts rose from 2.8 birds per standardised urban plot in…
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No Stand-level Reduction in Blue Tit Breeding Performance Was Detected With Moderate Conifer Admixture
Across 63 Bavarian forest plots, blue tit nest-box occupancy, clutch size, total brood mass and hatching success were…
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Feather Element Profiles Differed Between Farmland- and Forest-associated Songbirds
At one Polish winter feeding site, greenfinches and goldfinches showed wider variation in feather element profiles than two…
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Eurasian Blue Tits Changed Nest Design After Previous Breeding Success or Failure
A Scottish study found that Eurasian blue tit females adjusted nest materials according to earlier breeding outcomes. Among…
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Juvenile Great Tits Reacted More Strongly to Groups of Mobbing Callers
Wild juvenile great tits were more likely to approach mobbing calls representing several birds than a lone caller,…
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Male Blue Tit Endurance Rose 157% as Nestling Feeding Demands Increased
Male blue tit endurance increased from 9.8 to 25.1 minutes between days 5 and 14 of chick feeding,…
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Eurasian Blue Tits and Great Tits Showed Different Plumage Shifts Along Polish Urban Gradients
Across eight Polish urban–rural gradients, Eurasian blue tit breast brightness decreased while structural tail brightness increased toward more…
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Great Tits Outcompeted Blue Tits for Nest Boxes When Blue Tit Boxes Were Scarce
Manipulating nest-box availability showed that great tits could restrict blue tit access to breeding cavities, while the effect…
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Thinning Reduced Nestling Performance in Eurasian Blue Tits and Great Tits While Clear-cuts Lowered Willow Tit Recruitment
Long-term data from Oulu linked thinning with poorer survival and growth of Eurasian blue tit and great tit…
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Heated Nest Boxes Reduced Blue Tit Incubation Effort and Short-Term Parasite Loads
Warming blue tit nest boxes by about 3.3 °C reduced the time females spent incubating and was followed…
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Higher Social Density Increased Testosterone in Eurasian Blue Tit Egg Yolks
An experiment in 12 forest plots found that female Eurasian blue tits breeding at higher social density deposited…
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Great Tits Became About 5% Lighter Over 47 Years, With Early-Life Competition Linked to the Change
Great tits in Wytham Woods became about 5% lighter between 1978 and 2024. Birds from later cohorts entered…
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Leucocytozoon Infection Probability Rose From About 20% to 60% in Later-hatching Eurasian Blue Tit Chicks
In 320 Scottish Eurasian blue tit nestlings, Leucocytozoon infection probability rose from about 20% early in spring to…
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Common Grasshopper Warblers and Eurasian Tree Sparrows Declined Sharply at a Portuguese Ringing Station
A 27-year Portuguese ringing study found declines in all five long-distance migrants; common grasshopper warblers now barely occur…
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Smoked Cigarette Filters Raised Haemoglobin and Haematocrit in Eurasian Blue Tit Chicks but Parasite Reductions Were Weak
In 33 Eurasian blue tit broods around Łódź, Poland, smoked cigarette filters raised nestling haemoglobin and haematocrit compared…
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