Today we"re heading to the Netherlands to visit the red foxes at the Amsterdamse Waterleidingduinen Nature Reserve. This protected area about 8 miles west of Amsterdam is host to not only a diverse assortment of plants and animals, but also hundreds of specially designed sand dunes that help filter rainwater. The Waterleidingduinen ("water supply dunes") have been the source of the city"s drinking water since the 19th century.