(carduelis spinus)
The Siskin is a small woodland finch which is a common resident in Scotland. It is most often seen in winter when it forms flocks, sometimes of a hundred or more birds, which move around in a restless manner usually first detected by the characteristic twittering flock sound. It has a particular liking for the seeds of alder trees which remain on the tree over the winter. It will readily come to garden bird feeders usually with a preference for peanuts.