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However, his story is of questionable authenticity. In 1834, Audubon claimed that he tied silver threads to the legs of young eastern phoebes at his farm (Mill Grove) in Pennsylvania in 1805, and then resighted two of the birds as adults in 1806. However, the return rate he reported (40% of nestlings) is an extreme outlier compared to modern data (e.g., 1.6% of 549 banded nestlings, and 1.3% of 217 nestlings), and Audubon was in France when he claimed to have resighted

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