I've had my Silver Sebright hen (Silvette) for seven years or so. She used to look completely normal. For the last year, she has started growing strange new neck feathers that make her look very spikey when she fluffs them out. She's lost some tail feathers and lots of breast and wing feathers too. She has tried to crow too, but she's definitely a hen! She's not being picked on and her diet has not changed. Our other hens are completely normal. What is going on with my Silvette?!

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