OBOL.
Not just a split, but a USA endemic and just one state away. On our way to
Wyoming, my wife and I spent most of July 16th in the South Hills of Idaho
(Cassia County) hearing and seeing the Cassia Crossbill. A nice area to
explore. Besides seeing the Crossbill it was instructive studying the resident
Slate-colored Fox Sparrow comparing them to the breeding Thick-billed Fox
Sparrows of Central Oregon.
The link below has useful information of where to search for the Crossbill, and
also describes the factors that led to the evolution of this species.
.
https://idahobirds.net/birding-idaho/cassia-crossbill/
Steve Kornfeld
Bend
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