Spangle Budgerigar, SF & DF Genetics Guide
Autosomal incompletely dominant · Reverse wing markings (SF) / near-clear body (DF) · Origin: Australia, 1978
TL;DR
Spangle is an autosomal incompletely dominant mutation in budgerigars. A Single Factor (SF) Spangle shows reversed wing markings, clear feathers with dark edges, instead of the normal dark feathers with light edges. A Double Factor (DF) Spangle is almost entirely yellow (green base) or white (blue base) with normal dark eyes, often mistaken for Lutino/Albino, but distinguishable by the eye colour. Two SF Spangles produce a 1:2:1 ratio of Normal : SF : DF offspring. First documented in Australia in 1978.
Spangle at a glance
| Inheritance | Autosomal incompletely dominant, single factor (SF) or double factor (DF) |
|---|---|
| Copies needed to show | One copy shows as SF, two copies show as DF |
| Split carriers | None. A bird that does not show it does not carry it |
| Calculator settings | SF or DF |
| Where to find it | Mutation list, Dominant group |
QUICK ANSWER
Spangle at a Glance
- Gene symbol: Sp.
- Inheritance: Autosomal incompletely dominant.
- Single factor (SF): Wing markings reverse: a light feather with a dark edge instead of a dark feather with a light edge.
- Double factor (DF): Markings disappear almost entirely, leaving a mostly yellow or white bird.
- Pairing math: Autosomal incompletely dominant. A single factor (SF) already shows. Two copies (DF) change the bird again, so SF × SF returns 25% DF, 50% SF and 25% normal.
- Telling SF from DF: An SF Spangle keeps visible reversed wing markings. A DF Spangle is near-clear, and is often mistaken for a Lutino or Albino — but a DF Spangle has normal dark eyes, not red.
- Not sex-linked: Cocks and hens inherit Spangle identically.
Try these pairings instantly
→ SF Spangle x SF Spangle = 1:2:1→ DF Spangle x Normal→ SF Spangle x NormalWhat is Spangle?
The Spangle mutation reverses the wing-marking pattern of a normal budgerigar. Where a normal budgie has dark feathers with light edges, an SF Spangle has light (yellow or white) feathers with dark edges, creating the characteristic "spangled" look. The Spangle gene also reduces the dark colour at the throat spots, replacing them with hollow rings.
Because Spangle is incompletely dominant rather than fully dominant, the SF and DF phenotypes look very different. In SF Spangle the body and wing pattern remain recognisable; in DF Spangle the body is almost entirely clear of pigment, only the eyes, beak, and feet appear normal.
How is Spangle inherited?
Spangle sits on an autosome (not a sex chromosome) and shows incomplete dominance, meaning one copy of the gene produces a visible but partial expression (SF), and two copies produce a different, fuller expression (DF). The Punnett square outcomes follow standard Mendelian autosomal incompletely dominant rules:
Pairing Outcomes, Quick Reference
| Pairing | Normal | SF Spangle | DF Spangle |
|---|---|---|---|
| Normal × Normal | 100% | 0% | 0% |
| SF × Normal | 50% | 50% | 0% |
| SF × SF | 25% | 50% | 25% |
| DF × Normal | 0% | 100% | 0% |
| DF × SF | 0% | 50% | 50% |
| DF × DF | 0% | 0% | 100% |
SF vs DF, visual differences
- SF Spangle: body colour normal (green or blue series), wing markings reversed, clear feathers with dark trim. Throat spots become hollow rings. Highly prized for exhibition because the reverse pattern looks striking.
- DF Spangle: body nearly all yellow (green base) or white (blue base). Very faint or no wing markings. Looks like a Lutino or Albino at first glance, the key tell is the eye colour. DF Spangle has normal dark eyes; Lutino/Albino has red eyes.
Watch out, common DF Spangle confusion
One of the most common breeder errors is confusing DF Spangle for Lutino (or Albino). The mistake matters because the inheritance is completely different, Lutino is sex-linked recessive (hens cannot be split), Spangle is autosomal incompletely dominant. Always check the eye colour first.
Spangle combinations breeders favour
- Spangle Opaline: the wing-reversal of Spangle on the Opaline wing distribution, visually loud and popular on the exhibition bench.
- Spangle Cinnamon: Cinnamon's brown markings on Spangle's reverse pattern.
- Yellow Face Spangle (blue series): SF Spangle Sky Blue with Yellow Face shows striking yellow head with reverse wing markings.
- DF Spangle Cobalt: some breeders cross DF Spangles with Cobalts to track Cobalt alleles hidden under the clear body, useful for outcrossing programmes.
History & origin
The Spangle mutation was first reported in Australia in 1978 by Mr. Melville. By the early 1990s it had spread to the UK and continental Europe and was officially recognised on the WBO exhibition standards. It is now one of the most popular budgerigar mutations worldwide, both for pet stock and exhibition lines.
Spangle pairing outcomes, cock × hen
Every standard Spangle pairing and what it produces. Tap Try it to open the exact pairing in the calculator with both parents already set.
| Cock | Hen | Chicks (cocks and hens alike) | Calculator |
|---|---|---|---|
| SF Spangle | Normal | 50% SF, 50% Normal | Try it |
| SF Spangle | SF Spangle | 25% DF, 50% SF, 25% Normal | Try it |
| DF Spangle | Normal | 100% SF | Try it |
| DF Spangle | SF Spangle | 50% DF, 50% SF | Try it |
| DF Spangle | DF Spangle | 100% DF | Try it |
There are no splits for Spangle. SF means one copy, DF means two copies, and a DF parent passes Spangle to every chick.
Breeder warning
There is no split Spangle. A bird that does not show Spangle does not carry it, so treat any "split Spangle" listing as a mistake. DF Spangle birds are almost clear yellow or white with dark eyes. Do not mistake them for Ino, which has red eyes.
Predict any Spangle pairing instantly
The Budgerigar Genetics Calculator handles Spangle SF and DF correctly for every base colour and modifier combination. Select Spangle as a mutation, choose SF or DF, and the engine outputs offspring percentages, including the classic 1:2:1 ratio for SF × SF pairings.
Open the Calculator →References
- Martin, T. (2002). A Guide to Colour Mutations and Genetics in Parrots. ABK Publications, Tweed Heads NSW. ISBN 978-0-9577024-7-9.
- Rogers, C. H. (revised by Blake, J.). World of Budgerigars. Beech Publishing House. ISBN 978-1-85736-270-1.
- World Budgerigar Organisation (WBO), Exhibition Standards.
- Wikipedia: Budgerigar colour genetics, Spangle.
Further reading: Inte Onsman MUTAVI Research · Dr. Terry Martin (2002), ABK Publications
Browse by inheritance type: Sex-Linked (6) · Autosomal Recessive (11) · Autosomal Incomp. Dominant (10) · Guides & Tools (10)
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