EN
Thick-billed Parrot Rhynchopsitta pachyrhyncha



Taxonomy

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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- C2a(ii) A2cd+3cd+4cd;C2a(ii)

Red List history
Year Category Criteria
2016 Endangered C2a(ii)
2013 Endangered C2a(ii)
2012 Endangered C2a(ii)
2008 Endangered C2a(ii)
2007 Endangered
2004 Endangered
2000 Endangered
1996 Endangered
1994 Endangered
1988 Threatened
Species attributes

Migratory status nomadic Forest dependency High
Land mass type Land-mass type - continent
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 67,100 medium
Extent of Occurrence non-breeding (km2) 381,000 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 2000-2800 medium estimated 2004
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 30-49 - - -
Decline (10 years/3 generation past and future) 30-49 - - -
Number of subpopulations 1 - - -
Largest subpopulations 100 - - -
Generation length (yrs) 11.1 - - -

Population justification: In 2004, the population was thought to number 3,000-6,000 individuals, although more recent systematic counts gave a potential global population of 2,097 individuals (Cruz-Nieto et al. 2012). The population size is currently placed at c.2,800 mature individuals, derived from the statement by Ortiz Maciel and Cruz Nieto (2004) that an estimate of up to 140 nests in the Bisaloachic-Cebadillas region represented c.10% of the total known breeding population. Thus the number of mature individuals is assumed to fall within the range 2,000-2,800. However, these figures may represent an over-estimate, as not all of the nest cavities surveyed are used every year (M. A. Cruz-Nieto et al. in litt. 2007), and surveys in 2011 found 177 breeding pairs - estimated to be potentially 42% of the breeding population (Cruz-Nieto et al. 2011).

Trend justification: The species's population is suspected to be declining rapidly, in line with the clearance and degradation of its habitat, in particular the loss of breeding sites.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Mexico N Extant Yes
USA R Presence Uncertain Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Mexico Cebadillas
Mexico Corredor de Barrancas de la Sierra Madre Occidental
Mexico El Carricito
Mexico Guacamayita
Mexico Las Bufas
Mexico Maderas Chihuahua
Mexico Mesa de Guacamayas
Mexico Monte Escobedo
Mexico Nevado de Colima
Mexico Papigochi
Mexico Piélagos
Mexico Río Presidio-Pueblo Nuevo
Mexico Sierra de Taxco-Nevado de Toluca
Mexico Sierra del Nido
Mexico Tancítaro

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Montane suitable resident
Forest Temperate suitable resident
Altitude 2000 - 2700 m Occasional altitudinal limits 1200 - 3600 m

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Small-holder grazing, ranching or farming Timing Scope Severity Impact
Ongoing Whole (>90%) Slow, Significant Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Reduced reproductive success, Species mortality
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Whole (>90%) Rapid Declines High Impact: 8
Stresses
Ecosystem degradation, Ecosystem conversion
Climate change & severe weather Timing Scope Severity Impact
Future Majority (50-90%) Negligible declines Low Impact: 3
Stresses
Ecosystem degradation, Ecosystem conversion
Natural system modifications Fire & fire suppression - Trend Unknown/Unrecorded Timing Scope Severity Impact
Past, Likely to Return Majority (50-90%) Slow, Significant Declines Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food - human - - Non-trivial Recent
Pets/display animals, horticulture - - International Non-trivial Recent

Recommended citation
BirdLife International (2019) Species factsheet: Rhynchopsitta pachyrhyncha. Downloaded from http://www.birdlife.org on 25/04/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/04/2019.