Birds of the Beatrixpark, Amsterdam
Sparrowhawks June 2004
Bird Notes (Dutch)
Bird Adventures Spring and Summer 2005 (Dutch, pdf)
On the bird table Winter 2006
Bird observations, from Newsletter Fall 2006 (Dutch, pdf)
Juvenile Tawny owls in the Beatrixpark, from Newsletter Fall 2007 (Dutch, pdf)
How a screw disappears in a tree