The Tres Marías amazon (''Amazona tresmariae'') is an

Amazon parrot Amazon parrots are parrots in the genus ''Amazona''. They are medium-sized, short-tailed parrots native to the Americas, with their range extending from South America to Mexico and the Caribbean. ''Amazona'' is one of the 92 genera of parrots ...

in the family

Psittacidae The family Psittacidae or holotropical parrots is one of three families of true parrots. It comprises the roughly 10 species of subfamily Psittacinae (the Old World or Afrotropical parrots) and 157 of subfamily Arinae (the New World or Neotropi ...

. Many authorities consider it a subspecies of the

yellow-headed amazon The yellow-headed amazon (''Amazona oratrix''), also known as the yellow-headed parrot and double yellow-headed amazon, is an endangered amazon parrot of Mexico and northern Central America. Measuring in length, it is a stocky short-tailed gree ...

(''Amazona oratrix''), including the

American Ornithological Society The American Ornithological Society (AOS) is an ornithological organization based in the United States. The society was formed in October 2016 by the merger of the American Ornithologists' Union (AOU) and the Cooper Ornithological Society. Its m ...

, but is afforded full species status by the

International Ornithological Congress International is an adjective (also used as a noun) meaning "between nations". International may also refer to: Music Albums * ''International'' (Kevin Michael album), 2011 * ''International'' (New Order album), 2002 * ''International'' (The T ...

. It is endemic to the

Islas Marías The Islas Marías ("Mary Islands") are an archipelago of four islands that belong to Mexico. They are located in the Pacific Ocean, some off the coast of the state of Nayarit and about southeast of the tip of Baja California. They are part of t ...

off the Pacific coast of

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

Taxonomy

The Tres Marías amazon was formally described in 1900 by the American naturalist

Edward William Nelson Edward William Nelson (May 8, 1855 – May 19, 1934) was an American naturalist and ethnologist. A collector of specimens and field naturalist of repute, he became a member of several expeditions to survey the fauna and flora. He was part o ...

. He considered it as a subspecies of the

(''Amazona oratrix'') and introduced the

trinomial name In biology, trinomial nomenclature refers to names for taxa below the rank of species. These names have three parts. The usage is different in zoology and botany. In zoology In zoological nomenclature, a trinomen (), trinominal name, or ternary ...

''Amazona oratrix tresmariae''.

Frank Gill Frank Gill may refer to: * Frank Gill (Australian footballer) (1908–1970), Australian rules footballer with Carlton * Frank Gill (footballer, born 1948), footballer for Tranmere Rovers *Frank Gill (politician) (1917–1982), New Zealand politicia ...

Pamela Rasmussen Pamela Cecile Rasmussen (born October 16, 1959) is an American ornithologist and expert on Asian birds. She was formerly a research associate at the Smithsonian Institution in Washington, D.C., and is based at the Michigan State University. Sh ...

and David Donsker in the list maintained on behalf of the

International Ornithological Committee The International Ornithologists' Union, formerly known as the International Ornithological Committee, is a group of about 200 international ornithologists, and is responsible for the International Ornithological Congress and other international ...

(IOC) treat the Tres Marías amazon as a full species based on a 2004 study that analysed differences in mitochondrial DNA sequences. Other ornithologists have chosen to retain this parrot as a subspecies. The species is

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...

: no subspecies are recognised.

Description

It has an all-yellow head, reaching to the foreneck and upper breast, and a yellow-tipped tail. It has white eyerings and orange-brown eyes. It has small red patches on its shoulders. Upperparts are paler green than ''Amazona oratrix'' and the underparts are blue-washed. In aviculture, a variety of yellow-headed amazon known as "magna" exists, which has been selectively-bred to maximize the yellow coloration of the head. Magna birds closely resemble Tres Marías amazons.

References

Tres Marías amazon Endemic birds of Western Mexico Fauna of Islas Marías Tres Marías amazon {{Parrot-stub