Juvenile Y-B Cuckoo-Greensfelder Memorial-Creve Coeur Lake
 
I saw a juvie Y-B Cuckoo last week w/a dark bill.  All other attritributes associating this bird as a Y-B Cuckoo were present(no call or song,however).  Just wanted to know, when the bill would "change" to yellow? 
 
Bryan Prather
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St.Louis,Co

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