"The giant Palouse earthworm, a big white worm native to the Palouse prairie region of Idaho and Washington state, was said to be abundant in the late 19th century -- then seemed to disappear.

Some people thought they never existed to begin with.

But now, researchers are digging them up again -- and that has some people worried."

Martin Kaste reports for NPR's All Things Considered April 27, 2010. [2]