Birds are on the higher hierarchy in a food chan than insects. You can presume that they are facing the risk of radiation more than insects or plants.
Brown-White swallows were found in Annaka city Gunma. It’s about 227 km from Fukushima.
Normal swallow is black and white.
Commissioned instructor, Koizumi(60) from Gunma prefectural institute of Agriculture and Foresty found one flying with normal swallows on 8/12/2012.
It was about 17cm long, flying along Kujuku river. Similar white swallows are found near a gulf course too.
Gunma wild bird society of Japan comments it is presumed to be albino because of mutation.
Iori Mochizuki