Green parakeet

The green parakeet ("Psittacara holochlorus") is a medium-sized parrot occurring in North and Central America, from the southernmost tip of Texas south to northern Nicaragua.
Description.
The green parakeet is 32 cm in length, and is mostly green in color. It also has a yellow beak. 
Diet.
It feeds on seeds, various fruits, and corn. It can sometimes be considered a crop pest. 
Habitat.
Wild birds primarily use scrub and swamp forests, woodlands, and forest clearings. The US population takes advantage of palm groves in cities.
Taxonomy.
This species was formerly placed in the genus" Aratinga" as "A. holochlora", and divided into various subspecies ("A. h. holochlora, A. h. brevipes, A. h. brewsteri, A. h. strenua," and "A. h. rubritorquis"). Later, it was split into three species as the green conure ("A. holochlora"), Pacific conure ("A. strenua"), and Socorro conure ("A. brevipes"). Today it is recognised as single species with a highly threatened subspecies ("Psittacara holochlorus brevipes") endemic to Socorro in the Revillagigedo Islands, Mexico.
Ecology.
Green parakeet pairs usually find holes in trees in which to nest, where the female lays three or four eggs. It also nests colonially in crevices on cliff faces. After the breeding season is completed, the birds form large communal roosts.
Distribution.
The species occurs from southern Texas and northern Mexico (including "P. h. brevipes" on Socorro Island) south through the Middle American isthmus to southwestern Nicaragua. It inhabits a variety of woody habitats. Since the Carolina parakeet's extinction and the thick-billed parrot's extirpation from the United States in the 1930's, the green parakeet remains the only confirmed native extant parrot species in the U.S. (another parrot species, the red-crowned amazon is considered by some authorities to be native to the Rio Grande Valley, but its ecological status is still debated). In western Nicaragua, their nesting sites lie within the El Chocoyero - El Brujo Protected Area, but the birds still face threats from the outside world when they leave the reserve to feed.
The "A. brevipes" subspecies is highly threatened by habitat loss due to feral sheep and predation by feral cats. Surveys from 2006 and 2007 estimated a population around 300 individuals, suggesting a population decline from previous population estimates.
The native status of populations in southern Texas is unclear, with some claiming them to be feral escapees. However, the groups in the Rio Grande Valley are now generally regarded as naturally occurring and native, because of the proximity of confirmed native populations, the deforestation of Tamaulipas which forced them to disperse, and earlier evidence from 1911 of these parakeets consuming a strawberry harvest at Combs.