Dear Martin,

in my opinion you met some people from Holland in Denmark who were
watching birds.

The Dutch name for "Rohrweihe" is " bruine kiekendief".

http://zoologie.forst.tu-muenchen.de/HEITLAND/BSWT/AVES/ACCIPITRIFORMES/ACCIPI
TRIDAE/circus.aeruginosus_01.html

What will it be next year? The dunes and coast of Holland?

Greetings

Jan
Rotterdam
Holland