The starlings come to the marshes to feed on the larvae of crane fly and garden chafers, which are found in their greates abundance in the wet grasslands. During the day, the birds search for food in the outer polders of Tønder marshes, whilst at night they overnight amongst the reeds. The areas in which they spend the night are constantly moving in order to avoid the attentions of birds of prey and because the reeds will break after a few days, thus leaving the starlings with their feet dangling in the water. It’s therefor impossible to know exactly where the starlings will settle for the night.