Dark-sided Flycatcher - Muscicapa sibirica

On 5 October 2024 Bas van Gennip and Marcel Lakeman were birding at the Ganzenhoek, Meyendel near Wassenaar ZH. Around 14:25 Bas van Gennip noticed a flycatcher with unusual features. He took several photographs and shared it with other birders on the local Whatsapp group. At 14:57 this picture was shared on the Dutch Birding Alerts, at first as Asian Brown Flycatcher Muscicapa daaurica, but hardly a minute later it was corrected into Dark-sided Flycatcher M. sibirica. The bird was seen till 17:59 hours by c 350 birders. It was sometimes elusive and always stayed c 1.5 meters above the ground and always on side branches of the omnipresent Maritime pines Pinus pinaster. The next day on 6 October 2024 it was still present, but it only found as late as noon, but was again seen till dusk, now by even more birders (c 400-500?) and better views were obtained. I rushed immediately after the first alerts and arrived at 16:25 hours and after some dying minutes I was able to see it several times between 16:34 and 17:40 hours. And for Gerard Steinhaus it was his 500th bird species in the Netherlands. Congratulations Gerard!