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

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

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...

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,...

On 14 July I stumbled upon a calling Iberian Chiffchaff (ca 45th record) in my hometown The Hague. Since calling birds are probably...