Koen Stork

Dutch birder, mainly on the island of Texel | voting member of the Dutch rarities committee (CDNA) | MSc Conservation Ecology at the University of Groningen

[Koen Stork @KoenStork]

@wathingsmecca @spurnbirdobs @RareBirdAlertUK @BirdGuides Wow! But surely it must be a Pacific with those barred flanks and limited white on breastsides?

[Koen Stork @KoenStork]

@JamesRMcCallum1 @Arcticprince Nice find! Fits right in with the hybrids we're used to seeing in NL.

[Koen Stork @KoenStork]

@9stan Allright, thanks Martin! Should be just a YBW then, but quite a tough nut to crack.

[Koen Stork @KoenStork]

@9stan Thanks Martin! Any recordings available? Hume's does have a short call which can be almost identical to YBW.

[Koen Stork @KoenStork]

@MarkFra64259515 @RareBirdAlertUK @BirdGuides Wow! How did you exclude a White Tern?

[Koen Stork @KoenStork]

@ironfists67 Willow Warbler it is. Note the contrasting supercilium, saturated yellow colour, light underparts and long primary projection.

[Koen Stork @KoenStork]

@SteveMcDonnell4 @PaulCave3 Thanks! Good that you took a photo. Would you mind trying to upload the observation to https://t.co/gEV5JjivwA? Would help us, local bird reviewers, a lot! Thanks in advance!

[Koen Stork @KoenStork]

@BlaenavonNature Wow! That looks close! Congrats!

[Koen Stork @KoenStork]

@DagChaseBirder @dutchbirding Still there today. Proves to be very reliable, following the exact same pattern every day.

[Koen Stork @KoenStork]

@RIAllison62 There's little out of the ordinary. For UK birders Short-toed Treecreeper and Caspian Gull may be nice to see? There's also a Baikal Teal near Alkmaar and a Pygmy Cormorant near Lelystad that should be doable on the same day if you don't stay for too long with the Eider.

[Koen Stork @KoenStork]

@bobjstinger @01000011S If you've got a car it's a 10-min ride.

[Koen Stork @KoenStork]

Went back this morning for better views of the SPECTACLED EIDER. What. A. Bird. ~600 twitchers managed to connect, with the first foreigners from Germany and Belgium joining in. Probably a 3cy male, based on grey (not white) tertials.

[Koen Stork @KoenStork]

@aquilabirding This one's from @RodnyStolk

[Koen Stork @KoenStork]

@01000011S Are there more twitchers from the UK coming? I'm always available for questions and information, just drop me a message. I'll be back in the weekend as well.

[Koen Stork @KoenStork]

@davybosman De poten zijn gefotografeerd en ongeringd.

[Koen Stork @KoenStork]

F*ckin Spectacled Eider on Texel!! Stressful drive from Groningen, but managed to tick it in the last light. #351 (CSNA) or #341 (IOC) for my Texel list, but definitely the most memorable one yet!

[Koen Stork @KoenStork]

@DirkStraalen Inderdaad! Ontbreken van flankvlek vond ik ook relatief makkelijk vast te stellen in het veld.

[Koen Stork @KoenStork]

Very relaxed twitch of the 1st Pacific Diver for The Netherlands this morning! Particularly interesting how the birds' appearance changed with behaviour and distance (see the differences between both clips attached).