http://www.duluthsuperior.com/mld/duluthtribune/news/nation/3206507.htm Posted on Mon, May. 06, 2002 Study reports parasitic worms cause frog deformities BY JEFF BARNARD ASSOCIATED PRESS GRANTS PASS, Ore. -- After slogging through 101 ponds and wetlands in five western states, scientists on the trail of a mysterious outbreak of deformities in frogs have settled on a microscopic parasitic flatworm as the prime suspect. Linked with existing laboratory studies showing that the trematode known as Ribeiroia ondatrae can cause the frogs to sprout extra legs, the new field work closes the loop by showing a direct correlation between the prevalence of the parasite and the number of...