The original statement was somewhat dramatic. Chickens are a social animal and are not meant to be alone - being a lone chicken is distressing to them and it should be avoided if at all possible. There is no need for them to be of the same breed.
Is it too soon to tell if I have roosters? - Page 2
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Update: I rehomed the roosters and kept my pullet. She did just fine by herself. Although she adopted me as her flock and has separation anxiety when I first leave for the day. When she hears me come home from work she cocka-doodle-doos until I come to her hutch and greet her! I got four chicks this past March and I am hoping they will integrate as a flock with her when they are grown. We will have to wait and see. I got two silkies and two Japanese White Tails. At least one is a roo. I suspect I might have three roos and 1 pullet. But still, I will have to wait to see.