Japanese Giant Salamander in river at night, moving through dark water

andrias japonicus japanese giant salamander night underwater daisen nawa river tottori japan wild scene shot copy space text space nobody no people prehistoric amazing biodiversity wildlife river monster japanese hellbender foraging science research natural aquatic cute endangered species nature threatened endangered salamander animal conservation water amphibian camouflage hunting osanshouo davidianus cryptobranchidae flowing alleganiensis cryptobranchus reveal hiding tubercle