Separating Sagebrush Sparrow and Bell's Sparrow

Looks difficult.
Peter Pyle 2013, https://www.sibleyguides.com/wp-content/uploads/On-separating-Sagebrush-and-Bells-Sparrows.pdf

Sagebrush Sparrow (A. nevadensis, formerly A. belli nevadensis) was elevated to species by AOU in 2013 from Bell's Sparrow (A. belli) and its subordinate subspecies, A. b. canescens (near A. nevadensis), A. b. belli, A. b. cinerea, and A. b. clementae.

It appears that A. nevadensis and A. b. canescens may be most difficult to separate in winter when the ranges of worn individuals overlap.

由使用者 cnddb_brian 在 2023年01月28日 01:33 所貼文