I finally found some time to write up a trip report from our birding trip to Bialowieza and Biebrza last May. Highlights were two pairs of Citrine Wagtails, Pygmy Owl, male Pallid Harrier, Three-toed WP, White-backed WP in 5 locations, Nutcracker, Hazel Hen, Bee-Eater, Aquatic Warbler, Great Snipe and many more.
Hope this will help others who plan to visit the area this year.