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

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