| Thick-billed parrot | |
|---|---|
 | |
| Adultthick-billed parrot,Rhynchopsitta pachyrhyncha atCincinnati Zoo, US | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Psittaciformes |
| Family: | Psittacidae |
| Tribe: | Arini |
| Genus: | Rhynchopsitta Bonaparte, 1854 |
| Type species | |
| Rhynchopsitta pachyrhyncha[1] Swainson, 1827 | |
| Species | |
Rhynchopsitta pachyrhyncha(Swainson, 1827) | |
Thethick-billed parrots are stocky brilliant greenNeotropical parrots with heavy black beaks of genusRhynchopsitta of thick billed macaw-like parrots. The genus comprises two extant species, thethick-billed parrot and themaroon-fronted parrot, as well as an extinct species from theLate Pleistocene inMexico. The two extant taxa were formerly considered conspecific; they have become rare and are restricted to a few small areas in northern Mexico. The range of the thick-billed parrot formerly extended into the southwestern United States; attempts at reintroduction have been unsuccessful so far.
The two living species have a similar overall appearance, the principal differences lying in their relative sizes and brightness of coloration. Both are mainly green, with red or maroon markings on the forehead, forecrown, broad superciliary stripe, andfeathers on the bend of thewing, the carpal edge and the thighs. Their eye-rings are yellow, with the feet andbeak dark gray to black. Juveniles have a pale beak fading to gray at the base,[2] whitish eye-rings, and a red brow, but lack the dark red stripes over the eye-rings. Themaroon-fronted parrot is generally dark green withmaroon-brown head markings and is between 40 cm (16 in) and 45 cm (18 in) in length while the thick-billed parrot is about 38 cm (15 in) long with brighter colors.[3][4][5]
The genus was described by French naturalistCharles Lucien Bonaparte; the name is derived from theAncient Greek termsrhynchos "beak", andpsitta "parrot". The two extant taxa were considered subspecies of a single species,[5] before being split.[6]
Rhynchopsitta phillipsi, a larger prehistoric relative, was described fromLate Pleistocenefossils found inNuevo León,Mexico.[7] It was not an ancestor to the living species, as bones of them were also found atSan Josecito Cave whenR. phillipsi's remains were recovered. The prehistoric species had a distinct bill shape and may have occurredsympatrically with themaroon-fronted parrot in the northernSierra Madre Oriental.[8] Possibly its bill was adapted to feeding on a species ofpine which disappeared due toclimate change at the end of thelast ice age, driving it toextinction.
Both extant species are found at heights of between 1500 and 3000 masl in Mexico in isolated island-like forest habitats in theSierra Madre,[5][9] and are sometimes called snow parrots because of their high-altitude habitat.[10] They show seasonal migration patterns,[5][10] generally breeding in the northern parts of their range and overwintering in the southern.[3][4][11] The thick-billed parrot nests intree cavities,[3][9] while the maroon-fronted parrot is a cliff cavity breeder.[4][9] The parrots roost at night in large flocks, while they forage during the day in smaller flocks over a large area.[5] They feed primarily onpine seeds, which they extract by systematically stripping thecones from the base to the top.[5][10] They also eat other seeds such asacorns, as well as softer foods such asfruits,bark,nectar, other vegetable matter, andinsects.[5][10]
Both the thick-billed and the maroon-fronted parrot are classified asendangered by theInternational Union for Conservation of Nature. They are listed onCITES Appendix I, trade forbidden except for legitimate conservation, scientific or educational purposes. They are also protected under Mexican General Wildlife Law (2008), import and export prohibited. The populations of both species have declined primarily due to habitat degradation, and now both are restricted to a few small areas in the mountains of northern Mexico.[12][13] The range of the thick-billed parrot formerly extended intoArizona andNew Mexico, and attempts are being made to breed the species in captivity for release into the wild in their former range their.[11][13] An earlier attempt in the 1980s and 1990s to reintroduce thick-billed parrots to Arizona failed because the captive-bred birds had not learned to avoid their natural and human predators,[14] but new plans for the reintroduction of this species include the use of wild-caught individuals.[15]
| Common name | Scientific name and subspecies | Range | Size and ecology | IUCN status and estimated population |
|---|---|---|---|---|
| Thick-billed parrot
| Rhynchopsitta pachyrhyncha (Swainson, 1827) | Sierra Madre Occidental inMexico (and reintroduced to the U.S.)[13] | Size: A mostly green medium-sized parrot, 38 cm (15 in) long. Adults have a large black bill. a red brow, amber irises, red at the bend of the wings, and red thighs. Juveniles have brown irises and a pale peak. The under-wings and tail appear blackish.[3] Habitat: Diet: | EN |
| Maroon-fronted parrot
| Rhynchopsitta terrisi R.T. Moore, 1947 | Sierra Madre Oriental in Mexico[12] | Size: A large mostly green parrot about 40 cm (16 in) to 45 cm (18 in) long. The adults have a dark maroon brow which extends over the rim of bare yellow skin that surrounds the eyes. They have a brighter red at the bend of the wing. The tail is long and pointed. The underside of the wings are blackish.[4] Habitat: Diet: | EN |
| Species | |||
|---|---|---|---|
| Common and binomial names[6] | Image | Description | Range |
| †Rhynchopsitta phillipsi | Large parrot with a distinct bill shape | Late Pleistocene fossils of the extinct parrot have been found in Mexico. | |
