In Fukushima, years after the nuclear powerplant first leaked dangerous radiation, the animals are starting to return— including groups of wild boars, some of them in matrilineal packs called sounders. Scientists report they've become more agressive. Perhaps it's an effect of the abnormally high levels of caesium now in their blood: 300 times more than the safe human dose. Something so dangerous is bound to manifest in the living body; now, apparently, they've become virtually in- destructible. Former residents trying to come back to their homes are afraid of being attacked. The boars roam freely in the streets, barge through fences and abandoned sheds, snort among the ruins. There are pictures of them floating around on the internet— None look dipped in green DayGlo, but their bristly hair makes them look as though a child has outlined them in dark crayon with short, stubby strokes: a jolt of current holding them in.