Pheasant Colouring

I have several pheasant 'escapees' that enjoy the feast that I put our for
our growing bird (and wood mice...!) population. I have noticed that over
the last few seasons, their colouring is becoming more and more hit and
miss. I have two that resemble a hen mixed with a pea*** (although,
notably, an impossibility) and three males that lack the usual red and have
a purple chest with a fawn (rather than the usual deep red/brown) rear. Is
this common? Could this be due to interbreeding? I have noticed that the
'different' birds are significantly thinner and more skittish.

Sian


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