seals in the natural reserve of the wattenmeer in germany in amrum (oomram

amrum animal beach biology birds coast cute dogs flat flood frisian germany heritage howler island mammals marine mud mudflat nature north northern northsea northseal ocean odde of pinniped pup reserve robbe sand sandbank sea seabirds seal spray surf swarm tidal tideland urchin wadden water watt wattenmeer waves world young zoology