A Photojournalist Takashi Morizumi posted a couple of radioautographs of a dead
Japanese Bush Warbler Narcissus Flycatcher found in Iitate, Fukushima on his blog.
The black spots on the radioautographs indicate cesium 137. Duration of exposure is a month.
See pictures on his blog post:
The bird is actually Narcissus Flycatcher which is very similar to Japanese Bush Warbler. It’s been corrected by Mr. Morizumi.