Our use of Cookies

This site uses only cookies strictly necessary to ensure the site works correctly.

Please read about how we use cookies.

Hide this message

Strictly necessary and non-essential cookies

By clicking accept all cookies, you agree to our use of cookies and to our cookie policy.

We use third-party cookies on this site.

You have accepted necessary cookies only

You can change your cookie settings at any time
Hide this message

Monk Parakeet
Myiopsitta monachus

Last edited: October 2nd 2019

Monk Parakeet

Monk Parakeet - Myiopsitta monachus

Expand and collapse the sections below by clicking on the title or + / - icons.

Short description of Myiopsitta monachus, Monk Parakeet

Monk parakeet is a noisy, long-tailed, long-winged parrot, smaller than ring-necked parakeet but larger than budgerigar – mainly bright green, with pale ash-grey forecrown, face and breast. The flight feathers of the wing are dark blue, the bill orange and the feet pinkish-grey.

Impact summary: Myiopsitta monachus, Monk Parakeet

Well-established introduced populations elsewhere have had significant economic impact, and effects on ecosystems and human health, but there have been no similar reports as yet from GB.

Habitat summary: Myiopsitta monachus, Monk Parakeet

There are isolated breeding colonies in London and Hertfordshire, but individuals might be met with elsewhere – especially if a potential source of escapes is nearby. In its natural range the species is able to nest in young woodland, including eucalyptus plantations, where it can avoid competition with hole-nesting parrot species, which mostly require the presence of large, old trees. Introduced populations have thrived in urban areas.

Overview table

Environment Terrestrial
Species status Non-Native
Native range Brazil, Argentina Distrito Federal, Bolivia, Paraguay, Uruguay
Functional type Herbivore
Status in England Non-Native
Status in Scotland Non-Native
Status in Wales Non-Native
Location of first record New Forest
Date of first record 1899


The species is native widely across central regions of South America, and is generally abundant, inhabiting grassland, scrub and forest regions. It breeds readily in captivity and has been traded worldwide in very large numbers as a cagebird.

First Record

The first known release into the wild in GB was of 31 birds at Whipsnade in 1936. Breeding colonies have been known in the wild in GB since the 1970s.

Pathway and Method

CITES reports that 5,215 birds were imported into the UK between 1975 and July 2007. Argentina alone is reported by CITES to have exported more than 200,000 birds during a recent 25-year period. Many more birds in captivity will have been captive-bred. Birds in captivity occasionally escape, and deliberate releases, although illegal, may also be occurring, for example when owners no longer feel able to look after their pets.

Species Status

The present status in GB is that occasional individuals may occur widely, usually near human habitation, mostly as recent escapes from captivity. Breeding colonies have been recorded as far north as Huddersfield, but most have been unsuccessful. There are breeding colonies currently in London and Hertfordshire. Self-sustaining or invasive feral populations occur widely in the Americas and Europe, and in Israel and Japan.

Dispersal Mechanisms

Dispersal has occurred widely through aviculture and the international trade in wild birds. Natural rates of dispersal are low. They are considered largely sedentary and will often not forage at distances beyond 1.5 km (Butler 2005). Although natural spread is slow, further escapes and releases significantly boost the rate of range expansion (Martin & Bucher 1993, Hyman & Pruett-Jones 1995). In the USA, populations are expanding exponentially, doubling every 6–7 years (Pruett-Jones et al 2007). Numbers are especially high in Florida and in the New York region. Control measures in the early 1970s reduced the population by about 50% by 1975 but were then abandoned. Spain holds a large and widespread population, which is expanding exponentially, with much suitable habitat as yet uncolonised (Muñoz & Real 2006). In Catalonia, the population is doubling at intervals of about 9 years. The first known records in Spain were in Barcelona in 1975.


Uniquely for a parrot, this species builds stick nests rather than nesting in holes. Colonies build communal stick structures, which can grow to several cubic metres in volume, with a separate entrance and chamber for each pair. These nests are typically built in trees, but also on manmade structures, such as electrical substations and power poles, and (in the native range) in cliff fissures. Breeding can occur almost year-round, with several broods per pair.

Known Predators/Herbivores

In GB, nest predators might include squirrels but predators of the adults would be limited to cats and birds of prey.

Resistant Stages

None known.

Habitat Occupied in GB

Monk parakeets in GB occur in urban, suburban or semi-rural settings, mostly close to likely sources of escapes or releases of captive birds. Unlike most parrots, which nest in holes, this species is not dependent on large trees for nesting.

Free-living colonies have arisen in Devon, London and Hertfordshire.  Records elsewhere are likely to refer to recent escapes.

Environmental Impact

Davis (1974) reported that monk parakeets had been observed killing native birds in the USA, and it is likely that competition for food would limit resources available for native species. Monk parakeets frequently dominate areas where food has been provided for wild birds (South & Pruett-Jones 2000).

Health and Social Impact

In an urban setting, some people may feel that the large nests are unsightly and that the noise that monk parakeets produce constitutes a serious nuisance (Davis 1974). Monk parakeets can also carry diseases that could be passed on to wild birds and poultry (Newcastle disease) or humans (psittacosis), where a pathway of transmission exists (Stafford 2003).

Economic Impact

The monk parakeet is considered to be an agricultural pest in Uruguay (Mott 1973) and elsewhere in its native range (Navarro et al 1992). It is also becoming an agricultural pest in Florida (Tillman et al 2000) and has been observed damaging crops in New Jersey, New York, Ohio and California (Davis 1974).


BirdGuides Fact Sheet

Juniper, T. & Parr, M. (1998) Parrots: a guide to the parrots of the world.  Pica Press, Robertsbridge.

Biology, ecology, spread, vectors

Butler, C. (2002) Breeding parrots in Britain. British Birds, 95, 345–348.

Eberhard, J.R. (1996) Nest adoption by monk parakeets. Wilson Bulletin, 108, 374–377.

Eberhard, J.R. (1998) Breeding biology of the Monk Parakeet. Wilson Bulletin, 110, 463–473.

Gabb, R., Steventon, D.J., Turner, J.E. & Turner, M.G. (1994) Cheshire & Wirral Bird Report, 1993, 78.

Grant, K.R. (1996) Devon Bird Report, 1995, 68.

Holling, M. & the Rare Breeding Birds Panel (2007) Non-native breeding birds in the United Kingdom in 2003, 2004 and 2005. British Birds, 100, 638–649.

Hyman, J. & Pruett-Jones, S. (1995) Natural History of the Monk Parakeet in Hyde Park, Chicago. Wilson Bulletin, 107, 510–517.

Long, J.L. (1981) Introduced Birds of the World.  David and Charles, London.

Lever, C. (1987) Naturalized Birds of the World.  Longman Scientific & Technical, Harlow, UK.

Martin, L.F. & Bucher, E.H. (1993) Natal dispersal and first breeding age in monk parakeets. Auk, 110, 930–933.

Muñoz, A.R. & Real, R. (2006) Assessing the potential range expansion of the exotic monk parakeet in Spain. Diversity and Distributions, 12, 656–665.

Navarro, J.L., Martella, M.B. & Bucher, E.H. (1992) Breeding season and productivity of monk parakeets in Córdoba, Argentina. Wilson Bulletin, 104, 413–424.

Sol, D., Santos, D.M., Feria, E. & Clavell, J. (1997) Habitat selection by the monk parakeet Myiopsitta monachus during the colonization of a new area. Condor, 99, 39–46.

South, J.M., & Pruett-Jones, S. (2000) Patterns of flock size, diet, and vigilance of naturalized monk parakeets in Hyde Park, Chicago. Condor, 102, 848–854.

Van Bael, S. & Pruett-Jones, S. (1996) Exponential population growth of Monk Parakeets in the United States. Wilson Bulletin, 108, 584–588.

Wilson, A.M. & Slack, R.S. (1996) Rare and scarce birds in Yorkshire. Privately published.

Management and impact

Avery, M.L., Greiner, E.C., Lindsay, J.R., Newman, J.R. & Pruett-Jones, S. (2002) Monk Parakeet management at electric utility facilities in South Florida.  In Proceedings of the 20th Vertebrate Pest Conference (eds R.M. Timm & R.H. Schmidt), pp. 140–145. University of California, Davis. (full text)

Bucher, E.H. (1992) Neotropical parrots as agricultural pests. In New World Parrots in Crisis: solutions from conservation biology (eds S.R. Beissinger & N.F.R. Snyder), pp. 201–219. Smithsonian Institution Press, Washington, DC.

Davis, T.R. (1974) The Monk Parakeet: a potential threat to agriculture. In Proceedings of the 6th Vertebrate Pest Conference, pp. 253–256.  University of California, Davis, CA.

Defra website, updated 21 Jan 2008: Avian influenza (bird flu): Kept birds.

Manchester, S.J. & Bullock, J.M. (2000) The impacts of non-native species on UK biodiversity and the effectiveness of their control. Journal of Applied Ecology, 37, 845–864.

Mott, D. (1973) Monk parakeet damage to crops in Uruguay and its control. Proceedings of the Bird Control Seminar, 6, 79–81.

Pruett-Jones, S., Newman, J.R., Newman, C.M., Avery, M.L. & Lindsay, J.R. (2007) Population viability analysis of monk parakeets in the United States and examination of alternative management strategies. Human–Wildlife Conflicts, 1, 35–44.

Simberloff, D. (2003) How much information on population biology is needed to manage introduced species? Conservation Biology, 17, 83–92.

Tillman, E.A., Van Doorn, A. & Avery, M.L. (2001) Bird damage to tropical fruit in south Florida. Proceedings of the Wildlife Damage Management Conference, 9, 47–59.


BirdLife International (2008) Species factsheet: Myiopsitta monachus. Downloaded from http:www.birdlife.org on 552009

Forshaw, J.M. (2010) Parrots of the world.  Christopher Helm, London.

Lever, C. (2009) The Naturalized Animals of Britain and Ireland.  New Holland Publishers, London.

Spreyer, M.F. & Bucher, E.H. (1998) Monk parakeet (Myiopsitta monachus). Birds of North America, 322, 1–23.