National Geographic News (Washington DC, USA) August 3rd, 2011 12:11 PM: Pictures: U.S. Frogs Deformed by Parasite Infections
See how a parasite passed from snail to frog in the western U.S. can cause "grotesque" malformations such as extra hind limbs.
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Last edited by John; August 3rd, 2011 at 03:27 PM.
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