​​When the ladies from bird hospital De Wulp sent me the shots of the Grey-cheeked Thrush taken into care last year, it really knocked me off my feet for a f...

The 2018 ringing report for Meijendel, Wassenaar is out now! Download here (pdf; 4 MB; in Dutch only) English summary When the first day of a year sees the h...

There's a big if - but another big redpoll invasion could be in the making. The if depends on stuff like weather conditions, and the exact turn the majority...

First proof that it's the nominate subspecies of Hume's Leaf Warbler that reaches Europe. Aerobics, the final countdown and warbler taxonomy Back in the 80s,...

Probable Russian Common Gull, 5 February 2012, Meijendel, Wassenaar, the Netherlands I don't like using measurements as a diagnostic feature to ID sexes or s...

With the current redpoll invasion in Europe, it was time to spend some words and pics on these wonderful birds. Redpolls all the way from China Even though i...

Right. Chiffchaffs never stop to amaze me. But I now feel we're really getting somewhere. Only very recently Peter de Knijff and I wrote something about Sibe...

Autumn 2016 was nothing less than perfect. But this autumn, well... it was a bit boring to be honest. I missed most good vis mig days, ringing was often impo...

There are probably not too many primary moult scores for Great Skuas from Holland. But I've got one now! Since we usually only see them on migration, at a fa...

On 21 June Gijsbert Twigt and I trapped a Spotted Redshank in Meijendel, Wassenaar - the first one ever to be ringed at the site, where ringing started back ...