I photographed this White-breasted Nuthatch this week at the Canon City, CO Riverwalk. I heard this one and several more calling as they foraged along tree trunks and limbs, probing for tidbits between crevices.as the bird in the middle pic is doing.
The White-breasted Nuthatches found in the Interior West make a rapid fire double-noted call which sounds to me like 'bidi-bidi-bidi-bidi' (various sources describe the call differently). The call of these birds is usually different from Eastern and Pacific populations and Nathan Pieplow has done fantastic work on this.
Read his posts on this species here.
Check out the beautiful chestnut undertail and lower belly which is shown nicely in the bottom pic. SeEtta
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