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Order to know the route of migration and ecology , survey caught once , to Hocho it with a leg ring is continuing in various locations from 1961 to Oojurin . According to the research team , October 24, 11 , abnormal tail feathers were first identified in the study area of Niigata Prefecture . For this reason , it was an emergency survey of 17 stations in 14 prefectures from Tohoku to Kyushu .

Then , abnormality has been identified in the study area of all . Of the 5541 birds were examined to March 12 , abnormalities of the tail feathers of the same is found in the 767 birds which corresponds to 13.8% . 97.3% of birds with abnormal , the young bird was born in ’11 .

Last fall , the team reported in the Journal of the Ornithological Society of Japan these findings . From the fact that while the phrase “ could not be determined ” , abnormality was observed in all the study area , and the cause was pointed out the risk of changes in the environment of the region to use the route of migration , such as in common is impact . Potentially , I was considered and the influence of parasites, infection, malnutrition, thyroid abnormalities and radioactive material .