Or, more likely, Mothra!

Radioactive fallout from the Fukushima meltdowns has created mutant butterflies, researchers in Japan have said.

Scientists say they’ve detected an increase in mutations in leg, antennae and wing shape among butterflies, BBC reported.

As part of a study, the results of which were published in the British journal Nature, Japanese researchers collected 144 adult pale grass blue butterflies from 10 locations in Japan, including the Fukushima area two months after the March 2011 nuclear power plant accident.

The butterflies (whose scientific name is Zizeeria maha) would have been in the larvae stage as it was winter when the accident occurred, the researchers said.

In areas with more radiation in the environment, the butterflies had much smaller wings and irregularly developed eyes, the researchers found. The abnormalities were found in more than 10 percent of the butterflies surveyed, according to Australia’s ABC.

The rate of abnormalities rose to more than 33 percent with the second generation, with some butterflies dying before reaching adulthood.

“It has been believed that insects are very resistant to radiation,” lead researcher Joji Otaki from the University of the Ryukyus, Okinawa, told the BBC.

“In that sense, our results were unexpected.”