This video is about a reed bunting singing.
Translated from Dutch daily Leidsch Dagblad of 21 February:
Last year, four species of birds have nested for the first time there.
Last year, 535 breeding couples of twenty meadow bird species were counted. …
Like in 2005, the northern lapwing was the most important breeding bird in the area, with 111 breeding couples.
The most frequent breeders after the lapwing were mallards, coots, and black-tailed godwit.
According to the print edition of the daily, the number of black-tailed godwit nests rose from 50 in 2005 to 56 in 2006.
Measures for grassland birds in Duivenvoordse-Veenzijdse Polder: here.