Well, I've been looking closely through a half dozen field guides and in only one is there an illustration very close to the black goose at Walden Ponds today. In the Complete Sibley Field Guide on page 81 is a series of illustrations of Muscovy duck. The illustration that best fits the bird I saw is the juvenile female first year. But, Sibley's range map shows nothing like this ever occurring around here and all illustrations of domestic Muscovy duck show some white... I hope its still there tomorrow. Dave in Lafayette, Colorado
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