Rhynchopsitta pachyrhyncha


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Rhynchopsitta pachyrhyncha
Species Authority: (Swainson, 1827)
Common Name(s):
English Thick-billed Parrot
Spanish Loro Piquigordo, Cotorra-serrana Occidental, Periquito de Pico Grueso

Assessment Information [top]

Red List Category & Criteria: Endangered C2a(ii) ver 3.1
Year Published: 2013
Date Assessed: 2013-11-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S.
Contributor(s): Cruz, J., Cruz-Nieto, M.Á., Enkerlin-Hoeflich, E., Healy, S., Lammertink, M., Ortiz-Maciel, S., Peterson, A., Salgado, J. & Valdés-Peña, R.
Facilitator/Compiler(s): Benstead, P., Capper, D., Isherwood, I., Sharpe, C J, Taylor, J.
This species has a very small population which is declining owing to ongoing habitat loss and degradation. These factors mean that it qualifies as Endangered.

2012 Endangered

Geographic Range [top]

Range Description: Rhynchopsitta pachyrhyncha is largely restricted to the Sierra Madre Occidental, Mexico, in north-east Sonora, west Chihuahua, south and west Durango and Michoacán (two collected in April 1987 and 200 birds in April-May 1990 [J. Salgado in litt. 1998, Specimens in UMSNH per A. T. Peterson in litt. 1999] are the first records since 1941). Smaller, occasional or extirpated populations have occurred in Sinaloa and Jalisco. Seasonal migrations occur to the states of Nayarit, Jalisco, Colima and Michoacán (Ortiz Maciel and Cruz Nieto 2004). Pre-1960 records of Rhynchopsitta parrots from Coahuila, México and Veracruz may pertain to wanderers. It formerly occurred in USA, in Arizona and New Mexico, but had disappeared by the early 1990s (Ortiz Maciel and Cruz Nieto 2004). Reintroduced birds have bred in USA more recently. The population was estimated at fewer than 5,000 birds in 1992 (Specimens in UMSNH per A. T. Peterson in litt. 1999), and 1,000-4,000 in 1995 (Lammertink et al. 1996). In 2004, the population was thought to number 3,000-6,000 individuals, including c.2,800 mature individuals (Ortiz Maciel and Cruz Nieto 2004). These figures may represent an over-estimation, as not all of the nest cavities surveyed are used every year (M. A. Cruz-Nieto et al. in litt. 2007). Anecdotal observations by the rural residents of ejidos (communally owned lands) indicate a continued general decline in flock sizes and the frequency of sightings throughout its range, including the disappearance of some local populations (Ortiz Maciel and Cruz Nieto 2004).
United States
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: In 2004, the population was thought to number 3,000-6,000 individuals. The are possibly 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); there may even be fewer than 100 active nests each year (J. Gilardi in litt. 2010).
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It inhabits temperate conifer, mature pine-oak, pine and fir forests at 1,200-3,600 m, but breeds from 2,000 to 2,700 m (Monterrubio-Rico et al. 2006). It nests in tree-cavities (especially in pine snags and Pseudotsuga menziesii [M. A. Cruz-Nieto in litt. 1998, Monterrubio-Rico and Enkerlin-Hoeflich 2004]), often originally excavated by woodpeckers. The selection of tree species in which pairs nest appears to shift in reaction to changes in local availability (Monterrubio-Rico and Enkerlin-Hoeflich 2004). Breeding coincides with the peak in production of pine-seeds, which are the species's primary food resource (Ortiz Maciel and Cruz Nieto 2004). The egg-laying period is mid-June to late July (Monterrubio-Rico and Enkerlin-Hoeflich 2004). Flocks roost on cliffs, but reintroduced birds have used trees. Outside the breeding season, it is nomadic in response to variations in cone abundance.

Systems: Terrestrial

Threats [top]

Major Threat(s): Less than 0.06% remains of the original forest cover in the Sierra Madre Occidental ecoregion (Ortiz Maciel and Cruz Nieto 2004). There has been extensive modification of old-growth pine forests for timber and woodpulp. In the Sierra Madre Occidental, 80-85% of forest cover remains, but only 0.6% is old-growth (Lammertink et al. 1996). In 1994, there was extensive penetration and degradation of habitat in south Chihuahua by drug-growers, loggers and huge numbers of cattle. In the same year, forest stands at Mesa de Guacamayas were heavily burned (Monterrubio-Rico and Enkerlin-Hoeflich 2004). Fire remains a serious threat to the species (M. A. Cruz-Nieto et al. in litt. 2007). Logging has been intensive in the Sierra Madre Occidental, with no large fragments of old growth forest remaining in northern areas (Monterrubio-Rico and Enkerlin-Hoeflich 2004). Commercial logging in the area involves the removal of larger trees and standing dead wood, and appears to reduce nest-site availability by leaving few snags and pine trees large enough for the species to nest in. Such large-scale logging operations across the species's historic range may be responsible for its decline (Monterrubio-Rico and Enkerlin-Hoeflich 2004). As a result of habitat loss, breeding is now concentrated in two areas; Cebadillas de Yahuirachi and Madera (Monterrubio-Rico et al. 2006). Illegal trade in the species has fluctuated with peaks in the early 1970s and mid-1980s. Unofficial records confirm that the species is taken for illegal trade, but the extent of trapping is not known (M. A. Cruz-Nieto et al. in litt. 2007).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
CITES Appendix I and II and protected in the USA. The species is managed as part of the Association of Zoos and Aquaria's Parrot Taxon Advisory Group (Parrot TAG) and has been the subject of field studies since 1994.  A permanent research team, located in the Sierra Madre Occidental ecoregion, monitors nesting sites and studies its breeding biology (Ortiz Maciel and Cruz Nieto 2004) with the goal of developing sustainable forest management practices that incorporate the species's needs (Ortiz Maciel and Cruz Nieto 2004). Breeding or foraging sites at Tancítaro, El Carricito, Monte Oscuro, Mexiquillo, Las Bufas and Cebadillas have varying degrees of protection (Lammertink et al. 1996, J. M. Lammertink in litt. 1998, J. Salgado in litt. 1998, Anon. 1998, Specimens in UMSNH per A. T. Peterson in litt. 1999, E. C. Enkerlin-Hoeflich in litt. 2000, Monterrubio-Rico and Enkerlin-Hoeflich 2004). In 2003-2004, the Madera nesting area (the second most important breeding area) was in the process of being declared a National Forest Reserve, and efforts were underway for the protection of Mesa de Guacamayas (Monterrubio-Rico and Enkerlin-Hoeflich 2004). In 2002, a moratorium on timber extraction was signed by the Tutuaca Ejido at Bisaloachia (Cebadillas), which will protect 10% of the breeding population for 15 years (Enkerlin-Hoeflich 2000, Lurie and Snyder 2001, Ortiz Maciel and Cruz Nieto 2004). The agreement involves reimbursement of half of the value of the uncut timber to the ejido by NGOs, whilst the same organisations will also assist the community in recouping the other half of the value through alternative income sources (Ortiz Maciel and Cruz Nieto 2004). Such agreements are being promoted in the Madera region and to the Conoachi Ejido (Ortiz Maciel and Cruz Nieto 2004). Pseudotsuga menziesii is protected in Mexico (M. A. Cruz-Nieto in litt. 1998). Two captive-breeding facilities in USA have raised 127 chicks to fledging (S. Healy in litt. 1999) but reintroduction attempts have failed owing to disease, the inability to develop flocking behaviour, and predation by raptors.

Conservation Actions Proposed
Monitor population trends through regular surveys. Protect all current and historic breeding sites (Monterrubio-Rico and Enkerlin-Hoeflich 2004, Monterrubio-Rico et al. 2006), including those at Mesa Las Guacamayas and Cebadilla/Yahuirachic and Cocono/Cienaga de la Vaca from the exploitation of snags (Lammertink et al. 1996). Adopt forestry policies that have longer rotation cycles and retain snags (e.g. a minimum of five large snags per ha [Monterrubio-Rico and Enkerlin-Hoeflich 2004]). Restore degraded areas to a more mature condition (Monterrubio-Rico and Enkerlin-Hoeflich 2004). Implement forestry management practices that recognise the needs of the species (Monterrubio-Rico and Enkerlin-Hoeflich 2004), and incorporate tree species required for nesting and feeding (Monterrubio-Rico et al. 2006). Supplement natural nest cavities with nest boxes (to accomodate for the suitable maturation of trees, which may take 40 years) (Monterrubio-Rico et al. 2006). Study movements using satellite-tracking.

Citation: BirdLife International 2013. Rhynchopsitta pachyrhyncha. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 03 September 2015.
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