Common Name
It is sometimes still referred to by its obsolete common name, Olive-headed Brush-finch. That name is the result of an interesting error. A. flaviceps occurs in a very limited range, and is rare. Until the 1980s, it was known only from the two specimens collected on October 24 and 25, 1911, in the Toché River valley, and two additional specimens collected in 1942. Though the exact amount and brightness was variable in the few specimens, the bright yellow head of these birds was noted. It did not receive a standardized common name due to its rarity however, being only known to a few ornithologists for which the scientific name was sufficient. That name, however, duly referenced the striking color of the type specimen, an adult male.
In 1987, the first photograph of a living A. flaviceps was published. It showed a bird with very little yellow on the head, and altogether gave the impression that this species had a mainly dusky olive head. Widely distributed in a popular field guide, this photo led to the misleading common name, in use since the mid-20th century, becoming firmly established.
When the species was rediscovered at the type locality in 1989, it was noted that some birds had the mainly dusky olive head seen in the photograph. But as far as can be told, at least the adult males have the largely bright yellow head that was referenced in the original description of this species. Thus, BirdLife International chose the common name "Yellow-headed Brush Finch" in 1992, and the AOU eventually followed suit.
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