The variety "Magna" (or "Magnum") is bred for more yellow and commands a premium price as a pet. Some "extreme" Magnas have as much yellow as Tres Marías birds, but are distinguished from them by heavier barring on the chest and a less bluish tint to the green plumage. Wild birds give low-pitched, sometimes human-sounding screams, but often fly silently (unlike many other parrots). The calls can be described as "a rolled kyaa-aa-aaah and krra-aah-aa-ow, a deep, rolled ahrrrr or ahrhrrrr," etc. Young birds make a "clucking" sound to indicate that they are hungry. Distribution and habitat This species lives in riparian forest and areas with scattered trees, as well as evergreen forest in Belize and mangroves in Guatemala. A notable ecoregion of occurrence is the Belizean pine forests. It occurs singly or in pairs, in small groups, and occasionally in big flocks. The range formerly included both coastal slopes of Mexico from the Tres Marías Islands and Jalisco to Oaxaca and from Nuevo León to northern Chiapas and southwestern Tabasco, as well as a disjunct area including most of Belize, and another comprising a small part of northeastern Guatemala and northwestern Honduras. However, their numbers have been reduced drastically—by 90%, to 7,000, from the mid-1970s to 1994, and by 68% from 1994 to 2004—because of capture for the pet trade and habitat destruction. Introduced populations can be found in Stuttgart, Germany where a population of over 50 individuals resides. Smaller introduced populations are to found at Imperial Beach, Santa Ana, Loma Linda and Pasadena; all in Southern California. In addition, introduced –and apparently breeding– populations have been reported in Puerto Rico. Conservation status The yellow-headed amazon is considered endangered by the IUCN, and is listed under CITES Appendix I, which regulates the international trade of the species including those bred in captivity through a permitting system. Populations range from Central America, through Mexico, and even into the southmost region of Texas. The popularity of yellow-headed amazons as a pet continues to fuel poaching efforts, which have nearly driven it to extinction in the wild. Their wild population has declined from 70,000 to 7,000 in the past two decades alone. An estimated 40-60% of poached yellow-headed amazons die before they are sold. The situation for tresmariae, which potentially can be treated as a separate species, is unclear, but its very small range gives cause for concern and some reports indicate