The seeds are an important winter food resource for some birds, notably the European Goldfinch.
However, his Birds Of The British Isles (1948) was in colour with a total of 48 engravings, 25 in colour and the cover of the book had a coloured wood engraving of goldfinches.
Cameron constructed a small Swiss chalet with a library; a dairy of rough stones with a thatched roof, where milk products were kept and prepared, and an aviary in the form of a small classical temple with metal netting between the Dorian columns, which was filled with nightingale, goldfinch, starling and quail.
As vivarino means in Italian a goldfinch, he sometimes drew a goldfinch as the signature of his pictures.
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The large bill suggests a relationship with the Asian grosbeaks - e.g. Mycerobas - but its song and calls are reminiscent of European Goldfinch Carduelis carduelis, European Greenfinch C. chloris, and Yemen Linnet C. yemenensis.