Eulidia yarrellii is only known to breed regularly in the Azapa and Vitor valleys, Arica department, extreme north Chile4. Surveys since 2003 have failed to find it in the Lluta valley where it had previously been recorded in small numbers4. Stragglers have been found north to Tacna and possibly Moquegua departments, south Peru, and there is a historical record as far south as north Antofagasta province, but there are no recent records for Peru4. It was described as very common in the first half of the 20th century, with over 100 seen feeding together. More recent surveys have found the species to be scarce to locally common3, but it is unclear whether this reflects a serious decline or previous observers finding suitable flowering trees. In 2003 the Azapa valley held around 75 % of the total population, which was estimated at around 1,500 individuals4, while in 2007 the total population was estimated at around 1,200 individuals (55% in Azapa and 45% in Vitor)5.