Taxonomic note
Molothrus aeneus and M. armenti (del Hoyo and Collar 2016) were previously lumped as M. aeneus following AOU (1998 & supplements); SACC (2005 & updates); Sibley & Monroe (1990, 1993).
Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
- | - | - |
Year | Category | Criteria |
---|---|---|
2021 | Near Threatened | A2c+3c+4c; B1ab(ii,iii,v); C1+2a(ii) |
2016 | Vulnerable | C2a(ii) |
2012 | Not Recognised | |
2008 | Not Recognised | |
2004 | Not Recognised | |
2000 | Not Recognised | |
1994 | Not Recognised | |
1988 | Threatened |
Migratory status | not a migrant | Forest dependency | low |
Land-mass type | Average mass | - |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 13,300 km2 | medium |
Number of locations | 11-100 | - |
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | 2500-9999 mature individuals | poor | suspected | 2020 |
Population trend | decreasing | - | suspected | 2015-2025 |
Rate of change over the past 10 years/3 generations (longer of the two periods) | 20-29% | - | - | - |
Rate of change over the future 10 years/3 generations (longer of the two periods) | 20-29% | - | - | - |
Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 20-29% | - | - | - |
Generation length | 2.5 years | - | - | - |
Number of subpopulations | 1 | - | - | - |
Percentage of mature individuals in largest subpopulation | 100% | - | - | - |
Population justification: The population size has not been quantified directly, but the species is described as rare to common in suitable habitat (Renjifo et al. 2016). Nevertheless, assuming that not all of its range is inhabited, the population is suspected to not exceed 10,000 mature individuals; it is therefore here placed in the band 2,500-9,999 mature individuals. It is further assumed that all individuals belong to the same subpopulation. Based on its good dispersal abilities, ability to tolerate a variety of habitats, and the continuous records within the range (Renjifo et al. 2016; eBird 2021), it is assumed that all individuals belong to the same subpopulation.
Trend justification: Deforestation and land clearance has affected the species's range. Short-term trends quantify the rate of habitat loss as 23% over ten years between 2001 and 2011 (Renjifo et al. 2016). Since the species does inhabit disturbed habitats such as roadsides, population declines may be moderate; assuming that habitat loss is continuing at the same rate to the present day and into the future, the rate of population decline is precautionarily suspected at 20-29% over ten years.
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Colombia | extant | native | yes |
Country/Territory | IBA Name |
---|
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Artificial/Terrestrial | Arable Land | suitable | resident |
Artificial/Terrestrial | Pastureland | suitable | resident |
Artificial/Terrestrial | Rural Gardens | suitable | resident |
Artificial/Terrestrial | Subtropical/Tropical Heavily Degraded Former Forest | suitable | resident |
Forest | Subtropical/Tropical Dry | suitable | resident |
Altitude | 0 - 200 m | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Agriculture & aquaculture | Annual & perennial non-timber crops - Agro-industry farming | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
Agriculture & aquaculture | Wood & pulp plantations - Agro-industry plantations | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
Residential & commercial development | Housing & urban areas | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
Purpose | Scale |
---|---|
Pets/display animals, horticulture | international |
Recommended citation
BirdLife International (2024) Species factsheet: Bronze-brown Cowbird Molothrus armenti. Downloaded from
https://datazone.birdlife.org/species/factsheet/bronze-brown-cowbird-molothrus-armenti on 23/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 23/12/2024.