1. Yellow Faced Blue Two Yellow Faced ‘Colour Mutations’
One we shall call ‘Australian’
The other we shall call ‘European’

2. ‘Australian’ Single Factor

3. ‘Australian’ Single Factor
Produced by breeding:
Double Factor YLF to Normal – 100%
Single Factor YLF to Single Factor YLF – 50%
Single Factor YLF to Double Factor YLF – 50%
Single Factor YLF to Normal - 50%
Adult Body Colour
Sea green (on Sky) to dark bluish green (on Cobalt) and grey greenish (on Grey)
Not for exhibition since not pure blue or grey on body
Derived from outcrosses, so useful for breeding

4. ‘Australian’ Double Factor

5. ‘Australian’ Double Factor
Produced by breeding:
Double Factor YLF to Single Factor YLF – 50%
Single Factor YLF to Single Factor YLF – 25%
Body Colour
Blue – depth depends on Sky, Cobalt, Mauve or Violet; or Grey
Face and Mask
Buttercup Yellow or Golden
For exhibition and breeding

6. ‘European’ Single Factor

7. ‘European’ Single Factor

8. ‘European’ Single Factor
Produced by breeding:
Double Factor YLF (looks Normal Blue or Grey) to Normal – 100%
Single Factor YLF to Single Factor YLF – 50%
Single Factor YLF to Double Factor YLF– 50%
Single Factor YLF to Normal - 50%
Body Colour
Blue – depth depends if Sky, Cobalt, Mauve or Violet; or Grey
Face and Mask
Cream
For exhibition and breeding

9. ‘European’ Double Factor

10. ‘European’ Double Factor
Produced by breeding:
Double Factor YLF to Single Factor YLF – 50%
Single Factor YLF to Single Factor YLF – 25%
Body Colour
Blue – depth depends on Sky, Cobalt, Mauve or Violet; or Grey
Face and Mask
White (appearance indistinguishable from Normal)
For exhibition as a Normal

11. Basis for exhibiting Colour mutations (Colour modifying mutants)
Variety mutations

12. Colour mutations are….. Blue (normal)
‘European’ Yellow Faced Blue (normal)
Aust. Yellow Face Blue (normal)
All are allelomorphs mutated from the normal wildtype green
Represent the 4 budgie colours

13. Colour modifier mutations are…
Grey
Violet
Dark factor

14. Variety mutations are……
Blackeyed self – Dilute included
Redeyed self – Albino or Lutino
Clearwing
Greywing
Cinnamon
Opaline
Fallow
Etc etc

15. Where to exhibit? Green Blue Yellow Faced Blackeyed self Redeyed self
Clearwing
Greywing
etc etc
Yellow Faced near the top of the exhibition ‘tree’ with the other two Colour mutations
Currently Yellow Faced are misplaced among the Variety mutations in most Countries

16. What this means…….
Puts Yellow Faced into its rightful place based on a solid genetic reason
Green, Blue and Yellow Faced classes would contain only normals
Every Variety mutation can then be shown in all three colours rather than just the two colours
Green, Blue and Yellow Faced Blue colours
Puts an additional Colour mutation into each class below Yellow Faced, creating much more visual appeal, variety and interest in a declining hobby

17. An example or two…….
An Albino is variety mutation and Yellow Faced is a colour mutation thus should we not be exhibiting the variety first
A Fallow (Blue series) is a variety mutation and as explained above, Yellow Faced is a colour mutation thus I would conclude that we should be exhibiting the variety (Fallow) and if Yellow Faced then so be it.

18. Conclusion…….
‘Australian’ Yellow Faced Blue should only be shown in the Double Factor form
‘European’ Yellow Faced Blue only exists as a Yellow Faced in the Single Factor form
‘European’ Yellow Faced Blue in Double Factor form is visually ‘Normal’ and is shown as a Normal