Tristis: not always a peep show
pics © Marijn van Oss & Jorrit Vlot
sound © Thijs Fijen Earlier I wrote about Siberian Chiffchaffs with common Chiffchaff calls (here). That bird (mostly) looked like a Siberian Chiffchaff, and after analyses it indeed showed Siberian mtDNA - but in the field didn't utter the characteristic peep. No, it called like a Common Chiffchaff! Now the following bird, observed on Vlieland on 25 October by Thijs Fijen and his mates Marijn van Oss and Jorrit Vlot, could very well be a
