rosefinch
Refers to birds of the genus Carpodacus, often called rosefinches. The kanji spelling 猿子鳥 is rare; the bird is more commonly known as 猿子 (ましこ).
See also: マシコ
The rosefinch can sometimes be seen in places like Hokkaido in Japan.
Compound of 猿子 (ましこ, 'rosefinch') and 鳥 (とり, 'bird'). The exact origin of 猿子 is uncertain.