John L. Royael, Bird-Lore: Volume I, No. 1 — Notes from Field and Study… (1899)
“ Besides imitating the song of the Canary, he acquired the song of a bird in our collection known as the ‘Strawberry Finch,’ which he gave perfectly. His plumage was greatly improved by his confinement and the very great care given him, so much so, that one almost doubted his being an English Sparrow till convinced upon closer examination. We have had a large experience with these birds; they become very affectionate with petting, and show a wonderful degree of intelligence. ”
