European beaver floating in pond sniffs air and dives down into water, closeup

european beaver castor fiber beaver float pond sniff eurasian beaver dive down rodent semiaquatic large rodent water wildlife nature closeup swim aquatic swimming beaver fauna freshwater herbivore dam natural habitat rodentia castoridae herbivorous castor animal wild wet fur ecology outdoors biology environment no people nobody aquatic habitat looking at camera facing camera horizontal swedish wildlife swedish nature wildlife observation strong sense of smell smell