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Why are Mouthmarkings of particular importance?  Estrildid finches breed in dark tree hollows. The mouthmarkings are reflective. When the nestlings beg for food, they will instinctively move their heads and the reflecting markings help the parents to find the right way. Another important reason could be the detecton of brood parasitic nestlings in their own nest. On the pattern of the nestlings the parents identify the own species and usually don’t feed another nestling with another mouthmarking. This could also be a reason for the fact that the parents the own nestlings with special mutation colours don’t feed, because the colour of mouthmarkings can also change. 

THE MOUTHMARKINGS OF FINCHES

A special phenomenon in the world of birds are the mouthmarkings of Estrildid finches. Bright sparkling markings of the small nestlings are the identification marks of this species. Each species has a different pattern. Even in individual mutations may change the colour of mouthmarkings.
Gouldian Finches...
...green
... SF pastel green
... blue
... white
... lutino
Crimson Finch
 Tricoloured Munia
Star Finch
Zebra Finch
Violet-eared Waxbill