Identification: What is a Slender-Billed White-Breasted Nuthatch?

Slender-billed white-breasted nuthatches (Sitta carolinensis aculeata) are a denizen of low elevation oak habitats in the Pacific Northwest. Slender-billed white-breasted nuthatches are a genetically distinct subspecies, having evolved in a geographically separate area from other populations of white-breasted nuthatches in the western United States and becoming nearly entirely oak-obligate in the process.

They have specific preferences for their oak forests – canopy cover, tree age and size, and connectivity to other oak groves all come into play in determining the best habitat for these choosey nuthatches.

In some areas of their range where oaks have become scarce, they nest in other deciduous trees and can be seen at feeders.

Why are there so many subspecies unique to Garry oak woodland and prairie habitats in western Washington and Oregon? Learn more about the the ancient glacial legacy of the Puget Sound reflected in the at-risk subspecies found here.

Male slender-billed white-breasted nuthatch foraging in a Garry oak tree (Marissa Gibson 2025)

Slender-billed white-breasted nuthatches - male below, female above. (Illustration by Marissa Gibson 2025)

English Name: Slender-Billed White-Breasted Nuthatch

Scientific Name: Sitta carolinensis aculeata

Status: No Federal Listing | Species of Greatest Conservation Need (WA) | Sensitive (OR)

  • Bright white belly and face, inky black crown, with blue-gray back and wings.
  • Rusty undertail markings.
  • Females are warmer toned overall, with a lighter gray crown.
  • Namesake thin, slightly upturned bill

  • Song is a nasal “tooey-tooey-tooey”
  • Calls are a nasal “yank” repeated a few times, and squeaky chatter notes

  • Slender-billed white-breasted nuthatch pairs remain bonded year-round, enforcing their bond in the spring with complex displays, singing as early as February.
  • They nest in cavities of old growth oak trees, using old woodpecker holes or excavating their own, often using the same cavity for multiple years.
  • They lay a single clutch of 5 to 9 eggs per breeding season.
  • Slender-billed white-breasted nuthatches forage by spiraling down tree trunks in search of insects and seeds. They are known to cache food items for later in deep bark crevices of old trees.

Slender-billed white-breasted nuthatch range in Washington (WDFW)