Like many warblers, reed warblers live up to their name. No reed, no reed warbler. They have a preference for large marshes, however when the territory is already occupied, they look for other areas rich in reed. They can even be found in polder ditches as long as there is reed vegetation. They build their nest as a deep bowl between the reed stalks. Reed warblers feed on aquatic and land insects, spiders, worms and snails.