Dennis Rietdijk made this video.
They are, eg, pillwort fern and bog pimpernel. These species had disappeared there in the 1950s after the Doodemanskisten environment had deteriorated. A few years ago, conservation measures to improve the situation started.
This is a 2012 northern wheatear video from Ukraine.
Translated from Dutch Vroege Vogels TV:
Thursday, June 23, 2016
It’s been bad for years for the wheatears’ breeding in the Netherlands. It is estimated that there are no more than 270 wheatear couples in our dunes and other sandy areas. Terschelling foresters of the Forestry Commission counted during the last breeding season at least seventy couples. “And that’s probably an underestimate,” says ranger Joeri Lamers.
According to Lamers wheatears on Terschelling benefit from the extensive grazing taking place there. “Using, eg, goats and horses we stop overgrowth of the dunes. As a result, there is sufficient young marram grass, which in turn attracts insects, which in turn attract wheatears. We have sufficient open dune places where rabbits dig holes. The wheatears again need old rabbit holes to make their nests”.