Data Zone
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 |
|---|---|---|
| B1ab(ii,iii) | B1ab(ii,iii); D | B1ab(ii,iii); D1+2 |
| Year | Category | Criteria |
|---|---|---|
| 2020 | Critically Endangered | B1ab(ii,iii) |
| 2018 | Critically Endangered | B1ab(ii,iii) |
| 2016 | Critically Endangered | B1ab(ii,iii) |
| 2013 | Critically Endangered | B1ab(ii,iii) |
| 2012 | Critically Endangered | B1ab(ii,iii) |
| 2009 | Critically Endangered | B1a+b(ii,iii) |
| 2008 | Critically Endangered | |
| 2007 | Critically Endangered | |
| 2006 | Critically Endangered | |
| 2004 | Critically Endangered | |
| 2000 | Critically Endangered | |
| 1996 | Endangered | |
| 1994 | Endangered | |
| 1988 | Threatened |
| Migratory status | not a migrant | Forest dependency | Medium |
| Land mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 50 | medium |
| Number of locations | 1 | - |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 190-280 | good | estimated | 2006 |
| Population trend | Stable | good | estimated | - |
| Decline (3 years/1 generation past) | - | - | - | |
| Decline (5 years/1 generation past) | - | - | - | |
| Decline (10 years/1 generation past) | - | - | - | |
| Decline (10 years/3 generation future) | - | - | - | |
| Decline (10 years/3 generation past and future) | - | - | - | |
| Number of subpopulations | 1 | - | - | - |
| Percentage in largest subpopulation | 100 | - | - | - |
| Generation length (yrs) | 3.87 | - | - | - |
Population justification: Martínez-Gómez and Curry (1996) calculated a total population of 353 (287-419) individuals based upon comprehensive ringing data. Visits to the same sites during 2006-2007 reported a similar population. The estimate is best applied to the area of the island where ringing took place. This implies that the total population of the island may be larger (J. E. Martinez-Gomez in litt. 2007). This roughly equates to 190-280 mature individuals.
Trend justification: Largely owing to ongoing control of sheep on the island, the population appears to have stabilised; however, productivity may be more severely impacted by locust swarms in some years. The species has yet to expand its range following sheep eradication and ongoing feral cat eradication efforts (J. E. Martínez-Gómez in litt. 2016). Juveniles have moved into disturbed areas in the south-east of Socorro Island, but failed to successfully establish breeding territories. Adult males have occasionally established in these areas, but without adult females (J. E. Martínez-Gómez in litt. 2016).
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Mexico | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Mexico | Islas Revillagigedo |
| Mexico | Isla Socorro |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Dry | major | resident |
| Altitude | 300 - 950 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Felis catus | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
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| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Ovis aries | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | No decline | Low Impact: 4 | ||||||
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| Invasive and other problematic species, genes & diseases | Problematic native species/diseases - Schistocerca piceifrons | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
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| Residential & commercial development | Commercial & industrial areas | Timing | Scope | Severity | Impact | ||||
| Future | Minority (<50%) | Slow, Significant Declines | Low Impact: 3 | ||||||
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| Residential & commercial development | Housing & urban areas | Timing | Scope | Severity | Impact | ||||
| Future | Minority (<50%) | Slow, Significant Declines | Low Impact: 3 | ||||||
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Recommended citation
BirdLife International (2023) Species factsheet: Mimus graysoni. Downloaded from
http://www.birdlife.org on 05/02/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 05/02/2023.
