Hens adopting rooster behavior is quite common when there isn't a rooster around like tidbitting, mounting, crowing and even growing spurs. I had a SLW hen with spurs and have a GSH hen with them.
If your shed is more secure, could you put some windows in it? And once you do that maybe divide off an area for the young chicks so that they're not getting trampled or bullied?
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I suspect that if they wore nappies, they wouldn't create much mess. Probably less than my powder birds do. I just can't imagine them having a good time indoors. Mine like scratching dirt, there'd be nothing for them to do indoors. They need the garden to engage in their "hobbies"...
Agreed. I think it's also inevitable that we find our flocks outgrow that first coop before we know it (chicken math). In cases where a larger coop is needed/wanted, or maybe even one that functions better for our individual tastes,it's a great idea to hold onto the smaller/not so functional...