This is a very relevant question that is readily answered by the Sibley
Field Guide, which I find to be one of the most accessible authorities on
juvenile plumages. The juvenile plumages of the sapsuckers can be difficult
to differentiate, except the timing is different for the different species.
W
This brings me to ask the question: when do juvenile Yellow-bellied Sapsuckers
develop their adult head plumage?
On 04-05-21 I observed three Yellow-bellied Sapsuckers. They were an "adult"
male, "adult" female, and a juvenile. The male and female were doing courtship
displays. The juvenile fle
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