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They will roost when they're ready. Without adults to show them the ropes it takes a little longer.Thank you all for the the kind welcome.
A quick update - They both went into the coop on their own last night around 9pm and came straight out when I opened the door early morning which was good. I think they slept on the straw floor rather than the roost, will they need encouraging or should this be fine?
I have cornered off around 25 squared meters for them to explore today due to the run set up being small at the moment. They spent a good while exploring and now are happily chilling in the shade.