Japanese river otter (Lutra Lutra Whiteleyi)

The Japanese river otter (Lutra Lutra Whiteleyi) was discovered in the 1880's and it was even seen in Tokyo and its population began to decrease in the 1930's and became rare in the 1970's and it was declared extinct in different years just like the American ivory billed woodpecker. And how the Japanese river otter became extinct are the hunting and polluted rivers. And I thought it was declared extinct in 1959 and then it was declared extinct in 1979, 1991, and then 2012, and the ivory billed woodpecker was declared extinct in the 1920's, then the 1940's, 1950's, and then 2004. The otter apparently fed on fish, crabs, shrimp, eels, beetles, watermelons, and sweet potatoes. It was a subspecies of the Eurasian otter. The Japanese river otter is one of the 22 extinct otters. There is another extinct otter of Japan and that's the Japanese otter (Lutra Nippon). The last one was seen on August 28th, 2012.