I thought this was interesting. Japanese researchers collected earthworms 20-150 km away from the crippled power plant there and tested them for cesium. What they found is almost shocking; the earthworms collected had 1000-300 becquerels of cesium in them, depending on how far away from the plant they were collected. The government allowed limit for human exposure is only 500 becquerels. How can these earthworms, these small, moist, fragile denizens of the earth, be able to withstand such high contamination levels? Yet another mystery about worms.
You can see the article I got this information from here.
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