|Once a bird has a ring, its numerical code is internationally identifiable, and if it is recaptured, a short biography is available. We have already created more than 3,000 of such short biographies of birds ringed here. These histories tell us how long the birds stay, whether they return after winter, where they have bred or alternatively where they were hatched. The birds are weighed and measured, age and sex are established, along with whether the birds are replacing worn feathers (moulting) and if they have fat reserves for migration. Fat is the fuel for migration - high energy content and little weight.
The main focus of the research is the songbird ringing in the impenetrable, nutrient-rich ruderal vegetation of the Anlandebecken. One specialist project involves the ringing of waders. Other ringing activities include ringing Black Storks, rails and owls.