Data Zone
Taxonomic note
Thalurania colombica (del Hoyo and Collar 2014) was previously split as T. colombica and T. fannyi following Sibley and Monroe (1990, 1993), and subsequently T. ridgwayi was recognised following AOU (1998).
Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | C2a(ii) |
| Year | Category | Criteria |
|---|---|---|
| 2018 | Vulnerable | C2a(ii) |
| 2016 | Vulnerable | B1ab(i,ii,iii,v) |
| 2012 | Vulnerable | B1ab(i,ii,iii,v) |
| 2008 | Vulnerable | B1a+b(i,ii,iii,v) |
| 2004 | Vulnerable | |
| 2000 | Vulnerable | |
| 1996 | Vulnerable | |
| 1994 | Vulnerable | |
| 1988 | Lower Risk/Least Concern |
| Migratory status | not a migrant | Forest dependency | High |
| Land mass type |
Land-mass type - continent |
Average mass | 4 g |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 34,200 | medium |
| Number of locations | 6-10 | - |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 6000-15000 | poor | estimated | 2000 |
| Population trend | Decreasing | poor | inferred | - |
| Decline (3 years/1 generation past) | - | - | - | |
| Decline (5 years/1 generation past) | - | - | - | |
| Decline (10 years/1 generation past) | - | - | - | |
| Decline (10 years/3 generation future) | 1-9 | - | - | - |
| Decline (10 years/3 generation past and future) | 1-9 | - | - | - |
| Number of subpopulations | 1 | - | - | - |
| Percentage in largest subpopulation | 100 | - | - | - |
| Generation length (yrs) | 4.2 | - | - | - |
Population justification: The population size is preliminarily estimated to fall into the band 10,000-19,999 individuals. This equates to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals.
Trend justification: The species's population is thought to be declining slowly, in line with the on-going clearance of forest for agriculture within its range.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Mexico | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Mexico | Reserva Ecológica Sierra de San Juan |
| Mexico | Sierra de Manantlán |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Plantations | suitable | non-breeding |
| Forest | Subtropical/Tropical Moist Lowland | major | resident |
| Altitude | 250 - 1200 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Agriculture & aquaculture | Annual & perennial non-timber crops - Scale Unknown/Unrecorded | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
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Recommended citation
BirdLife International (2023) Species factsheet: Eupherusa ridgwayi. Downloaded from
http://www.birdlife.org on 24/03/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 24/03/2023.
