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Some odd-looking fish fossils discovered in the bowels of several European museums may help solve a lingering question about evolutionary theory, U.S. researchers said on Wednesday.
 
The 50 million-year-old fossils -- which have one eye near the top of their heads -- help explain how flatfish such as flounder, sole and halibut developed the strange but useful trait of having both eyes on one side.
 
But the trait has posed a problem for evolutionary biologists because no one had found any so-called transitional fossils -- fossils showing intermediate steps in the evolution of this trait.
 
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