In 1993, a Marsh Harrier pair failed to raise young from a ground nest near a small pool in the province of Groningen; the nest was probably predated by a fox. The same site was again occupied in 1994, This time, a nest was built in a willow, 1.75 m above water level (see photos). Four eggs were laid, of which three hatched and two fledged. No other tree-nests are known from The Netherlands, although a pair of Hen Harriers is known to have built a scrubnest on the island of Terschelling (no eggs laid, however).