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Fiddler crabs that burrowed into the relatively pristine marsh of Great Sippewissett made holes that were straight and stretched an average of 14.8 centimeters (the longest was 18 cm). In Wild Harbor, the burrows averaged 6.8 cm (none were deeper than 14) and showed erratic shapes as the fiddler crabs halted or turned laterally. The locations of the stunted, twisted burrows mapped closely with the location of residual oil in the sediments. (Illustration by E. Paul Oberlander, Woods Hole Oceanographic Institution)