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Much of the modern IBWO literature describes the Ivory-bill 'kent' call as a loud version of a White-breasted Nuthatch -- I've often used this comparison myself. Yet in re-reading parts of Tanner recently I realized he actually compared the call most favorably to the RED-BREASTED Nuthatch, not it's cousin! Upon playing tapes of both calls I concur the quality of the IBWO 'kent' is closer to the 'toot' of the latter bird than the 'yank' of the former. Thus far, Cornell has only mentioned sonographically comparing their AR. recordings to the WB; another comparison may be in order.
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