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A small, streaky, yellow-green bird hanging off your feeder is very likely a siskin. Siskins are little finches, about the size of a blue tit, with bold yellow wing bars and a forked tail. Males have a black cap and small black chin; females are paler and more streaked with no cap. They mainly feed on conifer, alder and birch seed, and turn up at garden feeders when those natural crops run short, most often from late winter into spring.
- Size: about 12 cm — tiny for a finch.
- Colour: green-yellow with dark streaks, yellow wing bars, yellow sides to the tail.
- Male: black cap and small black bib.
- Female: no cap, whiter belly, more heavily streaked.
- Favourite garden foods: sunflower hearts and nyjer.
How to identify a siskin
The quickest clues are size and acrobatics. Siskins feed like tits — hanging upside down, clinging to the underside of feeders — but have a finch’s pointed, conical bill. Look for:
- Fine dark streaks along the flanks.
- Two yellow wing bars on black wings.
- A short, notched tail with yellow at the base.
- A slim, sharply pointed bill — thinner than a greenfinch’s.
Male vs female siskin
| Male | Female | |
|---|---|---|
| Head | Black cap, black chin spot | Grey-green, no cap |
| Body | Bright lemon-yellow face and breast | Paler, whitish belly, heavier streaking |
| Wing bars | Bright yellow | Yellowish-white |
Young siskins in late summer look like washed-out, very streaky females.
Siskin, greenfinch or goldfinch?
| Bird | How to tell |
|---|---|
| Siskin | Small, streaky, black cap on male, thin bill, feeds upside down. |
| Greenfinch | Noticeably bigger and chunkier, plain olive-green with no streaks on adults, thick pale bill, yellow flash on wing edge. |
| Goldfinch | Red face, black and white head, broad gold bar across black wings. No green. |
| Female/young house sparrow | Brown and buff, no yellow at all. |
| Serin (rare) | Even smaller, stubby bill, yellow rump. A scarce visitor — a siskin is far more likely. |
Why this matters: greenfinches have declined by around two thirds since 1979 because of trichomonosis. Many people now see more siskins than greenfinches, and mistake one for the other.
When siskins visit gardens
Siskins breed mainly in conifer forests, especially in Scotland, Wales, northern England and plantation areas. In winter, numbers are boosted by birds from Scandinavia and the continent. They feed on spruce, alder and birch seed, so how many come to gardens depends on those crops. In years with a poor cone crop, gardens can fill with them; in good years you may barely see one.
The classic garden period is February to April, when natural seed is running out. Gardens near alder-lined rivers, birch woods or conifers see them most often.
What to feed siskins
- Sunflower hearts — the most reliable siskin draw.
- Nyjer seed in a dedicated nyjer feeder.
- Plant alder and silver birch if you have room — both carry seed into winter.
Feeding season: under the RSPB’s 2026 guidance, seed is paused from 1 May to 31 October to reduce disease. That fits siskins neatly — their garden season is winter and early spring, from November onwards.
Sound
Siskins are chatty. Flocks keep up a constant twittering, and the call is a clear, rising “tsu-ee”. The song is a fast, wheezy twitter that often ends in a drawn-out buzz.
Common questions
Why have siskins suddenly appeared in my garden?
Usually because natural seed crops have run low locally. Siskin numbers in gardens swing a lot from year to year.
Are siskins aggressive at feeders?
They’re feisty for their size and will squabble with each other and with goldfinches, but rarely hold a feeder for long.
Do siskins breed in gardens?
Rarely. They nest high in conifers, so gardens with tall spruce or pine nearby are the exception.
Can siskins catch trichomonosis?
Yes, finches as a group are vulnerable. Clean feeders weekly, move them regularly and stop feeding for a couple of weeks if you see sick, fluffed-up birds.
Related guides
- Greenfinch identification and decline
- Goldfinch guide
- Why nyjer seed isn’t being eaten
- Sick birds at the feeder: what to do
Sources: BTO BirdFacts and Garden BirdWatch; RSPB species profile for siskin; RSPB garden bird feeding guidance (April 2026 update).
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