It looks like Ruby is molting -- nothing to worry about, just a seasonal loss of old feathers and new feathers will grow in. The amount of molting varies from bird to bird, some get it bad, others barely lose any.
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They're so cute sitting like that, your mums so nice to have done that and by looking at your chickens, they were definitely not given very well treatment. Maybe you got them because they werent laying any eggs? Their faces looks very white. Congrats!