Siskins in all plumages show obvious green or yellow markings but can be told from Greenfinches or Serins by the yellow bars across the mainly black wings. Males have obviously yellow and black faces but the females are duller and more heavily streaked. Juveniles are streaked like females, but duller and browner.
Breeds in coniferous woodlands. Winters in gardens, and in riverside birches and alders.
Only in recent decades have Siskins started to feed on red peanut bags in gardens, a habit which quickly caught on, at least throughout Britain.
A largely migratory bird to the north which winters over a range of areas in search of food with many birds nomadic, moving great distances. Total numbers migrating from year to year will vary with food abundance. Southerly birds are less likely to move far.
For more details click here