The Oak and Juniper Titmouse used to be one species - the Plain Titmouse. That seems very confusing as neither live on the plains. Maybe it should have been Ordinary Titmouse or Unremarkable Titmouse? The Juniper half of the split falls mostly east of the Rockies but there is a small overlap in California. They do have different songs and calls though. The ones I photographed in Arizona on the south rim of the Grand Canyon and later on the north side were most certainly Juniper Titmice. They are not endemic to the US because they do cross over into Sonora Mexico.
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