Page "Brewer's Sparrow" Paragraph 9

Brewer's Sparrow has decreased in some parts of their range.

Causes are not well understood, but it is suspected that the decline is due at least in part to destruction of sagebrush habitat.

Additional information on resource use and limitation during the wintering season is desperately needed.

When the Timberline Sparrow was still considered a good species, Brewer's Sparrow was classified as Near threatened by the IUCN.

However, as only entire species are evaluated for the IUCN Red List, following the merger the entire population of S. breweri is classified as Species of Least Concern.