Close-up of two walruses, one sleeping, one scratching bacteria off his skin, on a beach along the northern coastline of Svalbard during a boat expedition

walrus scratching flippers bacteria skin beach big tusks close up walrus colony marine mammal animal pinniped large pinniped marine mammal grey sky svalbard wildlife atlantic walrus genus odobenus arctic wildlife marine mammals pinnipedia expedition arctic sea tusks svalbard cruise expeditions environment nature ecology population mammal sea polar climate outdoors landscape norway svalbard expedition natural environment panorama september climate change ocean outdoor cost travel