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Why do some baby male tiels have yellow faces when hatched , before their first molt , but still have normal , wild coloring? Does this mean they are pied with little pied genes?
 

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An oddity that I call the spot gene is a common cause of this, and the bird in your signature has some spot gene signs. I have an article on it here: http://www.littlefeatheredbuddies.com/info/breed-spotgene.html

It's not just the spot gene boys that can have yellow on or white feathers on their faces - the girls can have it too, and the girls will keep their markings for life. The boys lose the coloring at maturity and get regular male plumage in its place, the same way that pearl males do.
 
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