Background Image
Photo by Tom Grey

Cavity Nesting Birds and Abbreviations

These are the birds that we find nesting in our boxes and their standard four-letter codes designated by the Bird Banding Lab.

Bird Abbreviation
Acorn Woodpecker ACWO
American Kestrel AMKE
Ash-throated Flycatcher ATFL
Barn Owl BNOW
Bewick's Wren BEWR
Black-capped Chickadee BCCH
Black Phoebe BLPH
Chestnut-backed Chickadee CBCH
Downy Woodpecker DOWO
European Starling 1 EUST
House Finch (occasionally) HOFI
House Sparrow 1 HOSP
House Wren HOWR
Mountain Bluebird MOBL
Mountain Chickadee MOCH
Nuttall's Woodpecker NUWO
Oak Titmouse OATI
Red-breasted Nuthatch RBNU
Tree Swallow TRES
Violet-green Swallow VGSW
Western Bluebird WEBL
Western Screech-owl WESO
White-breasted Nuthatch WBNU
Wood Duck WODU

1 European Starling and House Sparrow are non-native, invasive species. Our Cavity Nesters Recovery Program is intended to help deter the use of nest boxes by these species.

Learn more about the Bird Banding Lab four-letter code system.