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Cuckoo calls, due to their low frequency, do not seem to get picked up by Old Bird's Thrush detector software.  I use Ravenlite to search a sound file for cuckoo calls.  See Finding Cuckoos Calls.

                                             Swainson's Thrushes can also be heard

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Yellow-billed Cuckoo call recorded 5-25-06 at 1:20 AM

Closer view of same call above

Yellow-billed Cuckoo recorded 5-26-06 at 1:42 AM