6 thoughts on “Brewer’s Blackbird (Euphagus cyanocephalus)”
The Audubon Christmas Bird Count (CBC) shows a 3.2% annual decline (95% CrI = 5.7 to 0.7) over the last 10 years, for a total 10-year decline of 27.6% (7.1% to 44.6%). The probability of a three-generation decline greater than 30% is 0.37. The probability of a three-generation decline greater than 50% is 0.01. The probability of a three-generation decline greater than 70% is < 0.01. These CBC estimates pertain to about 74% of the species winter range. These results support the up-listing of Brewer's Blackbird.
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments until 25 April 2025. We will now analyse and interpret the information, and we will post a preliminary decision on this species’ Red List category on this page on 25 April 2025, when discussions will re-open.
We thank Tim for the information shared in the above comment. Based on available information, our preliminary proposal for the 2025 Red List would be to adopt the proposed classification outlined in the initial forum discussion.
There is now a period for further comments until the final deadline on 4 May 2025, after which the recommended categorisations will be put forward to IUCN.
The final 2025 Red List categories will be published on the BirdLife and IUCN websites in October 2025, following further checking of information relevant to the assessments by both BirdLife and IUCN.
Grasslands National Park has in-person and/or ARU point count data on BRBL. Please contact the Ecological Integrity Monitoring or Wildlife Ecologists for the data.
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments. We will analyse and interpret the information, and a final decision on this species’ Red List category will be posted on this page on 12 May 2025.
Recommended categorisation to be put forward to IUCN
The final categorisation for this species has not changed. Brewer’s Blackbird is recommended to be listed as Near Threatened, approaching thresholds under Criteria A2b+4b.
Many thanks for everyone who contributed to the 2025.2 GTB Forum process. The final Red List categories will be published on the BirdLife and IUCN websites in October 2025, following further checking of information relevant to the assessments by both BirdLife and IUCN.
The Audubon Christmas Bird Count (CBC) shows a 3.2% annual decline (95% CrI = 5.7 to 0.7) over the last 10 years, for a total 10-year decline of 27.6% (7.1% to 44.6%). The probability of a three-generation decline greater than 30% is 0.37. The probability of a three-generation decline greater than 50% is 0.01. The probability of a three-generation decline greater than 70% is < 0.01. These CBC estimates pertain to about 74% of the species winter range. These results support the up-listing of Brewer's Blackbird.
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments until 25 April 2025. We will now analyse and interpret the information, and we will post a preliminary decision on this species’ Red List category on this page on 25 April 2025, when discussions will re-open.
Preliminary proposal
We thank Tim for the information shared in the above comment. Based on available information, our preliminary proposal for the 2025 Red List would be to adopt the proposed classification outlined in the initial forum discussion.
There is now a period for further comments until the final deadline on 4 May 2025, after which the recommended categorisations will be put forward to IUCN.
The final 2025 Red List categories will be published on the BirdLife and IUCN websites in October 2025, following further checking of information relevant to the assessments by both BirdLife and IUCN.
Grasslands National Park has in-person and/or ARU point count data on BRBL. Please contact the Ecological Integrity Monitoring or Wildlife Ecologists for the data.
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments. We will analyse and interpret the information, and a final decision on this species’ Red List category will be posted on this page on 12 May 2025.
Recommended categorisation to be put forward to IUCN
The final categorisation for this species has not changed. Brewer’s Blackbird is recommended to be listed as Near Threatened, approaching thresholds under Criteria A2b+4b.
Many thanks for everyone who contributed to the 2025.2 GTB Forum process. The final Red List categories will be published on the BirdLife and IUCN websites in October 2025, following further checking of information relevant to the assessments by both BirdLife and IUCN.