European Greenfinch (Carduelis chloris)
The European Greenfinch, or just Greenfinch, Carduelis chloris, is a small passerine bird in the finch family. This bird is widespread throughout Europe, north Africa and south west Asia. It is mainly resident, but some northernmost populations migrate further south. The Greenfinch has also been introduced into both Australia and New Zealand.
Woodland edges, farmland hedges and gardens with relatively thick vegetation are favoured for breeding. It nests in trees or bushes.
This species can form large flocks outside the breeding season, sometimes mixing with other finches and buntings. They feed largely on seeds, but also take berries and seeds (wikipedia).
The Greenfinch is susceptible to a parasite called Trichomonas gallinae, which is spread through the saliva of the birds so it is important to keep all bird tables and bird baths clean to prevent the disease from spreading.