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Trektellen.org

@trektellen.bsky.social

With every year 100,000+ observation hours by 1000s of observer Trektellen is the largest public database of migration / seawatch counts and ringing results.

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Thijs Fijen @thijsfijen.bsky.social · 06/03/2026

MASSIVE BUMBLEBEE MIGRATION! Yesterday, bird migration hotspot Breskens, the Netherlands, counted ~1000 migrating bumblebee queens in a SINGLE HOUR (trektellen.nl/count/view/1...). More on this extraordinary phenomenon: besjournals.onlinelibrary.wiley.com/doi/10.1111/... @trektellen.bsky.social

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Dungeness Bird Observatory @dungenessbirdobs.bsky.social · 08/05/2025

Some great seawatching today, with totals now posted on @trektellen.bsky.social

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Dungeness Bird Observatory @dungenessbirdobs.bsky.social · 25/04/2025

Most of the day coverage of the sea, with Bar-tailed Godwits picking up this afternoon and by the end of the day a great total of 3687 had flown east. Totals on @trektellen.bsky.social #kentbirding

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BioPhonia @biophonia.bsky.social · 02/04/2025

Vol de Nuit : Publication d'un état des lieux et comparaison de matériel pour le suivi national de la migration nocturne par acoustique passive 🌙 #lpo @mnhn.fr @trektellen.bsky.social #nocmig #bioacoustics

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Antikythera Bird Observatory @antikytherabirdobs.bsky.social · 30/03/2025

Day 2 of Spring 2025. The rain cut our season 1 round short, but we still managed to get things started and had 38 birds from 14 sps. The Willow & E Subalpine Warbler were the most common. Daily totals at @trektellen.bsky.social: www.trektellen.nl/count/view/1...

Woodchat Shrike, Lanius senator, Κοκκινοκεφαλάς

Eastern Bonelli's Warbler, Phylloscopus orientalis, Ανατολικός Βουνοφυλλοσκόπος

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Trektellen.org @trektellen.bsky.social · 21/03/2025

We slightly changed the position of the photos on the count page. We hope you like this better then the previous position in the side bar. Looking forward to your flight-shots!

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Batumi Raptor Count @batumiraptorcount.org · 07/01/2025

Spare a minute of your time to watch this short summary of what @batumiraptorcount.org does!🙏 Please consider supporting us: www.batumiraptorcount.org/support 🍀 #Ornithology #Birds #RaptorResearch #CitizenScience #BirdsOfPrey #BirdMigration #Crowdfunding @trektellen.bsky.social

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Lluís Brotons @lluisbrotons.bsky.social · 17/11/2024

Qui ho havia de dir 👉10.000 hores després, 110.100 ocells de 130 espècies 🤯🫣hem detectat durant les nits #Solsona #nocmig #SolsonaCastellvell des del 2020 @ICOcells @trektellen trektellen.nl/site/totals/28…

trektellen.nl

Trektellen.org

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Graham Sparshott @fifevismig.bsky.social · 31/12/2024

The ease of inputting data and interpreting it wouldn't possible without the brilliant Trektellen website bsky.app/profile/call...

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nick van der ham @nickvdh.bsky.social · 31/12/2024

Cduin: december 2024 staat online // december 2024 is online trektellen.nl/count/view/4...

trektellen.nl

Camperduin

2024/12/31 - Totals: 1397 individuals, 14 species, 3:00 hours

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Dr Callum Macgregor @callumjmacgregor.bsky.social · 27/12/2024

Like London buses, my second paper published in the space of a week! Working on the (substantial) impacts of HPAI on seabirds, it was fascinating to find that population changes in some of the hardest-hit species are reflected in @trektellen.bsky.social seawatch counts. dx.doi.org/10.1080/0006...

dx.doi.org

Impacts of highly pathogenic avian influenza on seabird populations in the North Sea are detectable in sea-watchers’ migration counts

Sea-watching counts provided evidence of declines in abundance of four seabird species during autumn migration, which were consistent with the timing of highly pathogenic avian influenza (HPAI) out...

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Richard K Broughton @richardkbroughton.bsky.social · 24/12/2024

Great new paper #BirdStudy Bird flu mortality reflected in #seawatching counts in @trektellen.bsky.social Impacts of highly pathogenic avian influenza on seabird populations in the North Sea are detectable in sea-watchers’ migration counts www.tandfonline.com/doi/full/10.... #ornithology #ukbirding

Great Skuas
(c) Rob Farrow
https://commons.wikimedia.org/wiki/File:Two_Bonxies_(Great_Skuas)_in_flight_-_geograph.org.uk_-_6889585.jpg

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Owen Beaumont @owenbeaumont.bsky.social · 26/11/2024

It was good to see a few Little Auk passing the Lincs coast last week, even if only a fraction of the counts recorded further north! A decent supporting cast too, with divers, ducks and kittiwake on the move. Full counts from Mablethorpe on @trektellen.bsky.social

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