https://www.bbc.co.uk/programmes/p008s5fl I don't know if it's a repeat - it seems to be part of a series and I know I watched the one about cats some years ago (ah, maybe that was secret lives).
I recorded it and watched the beginning - the bit about pecking order.
Not sure how much of the programme will be new to those of us who keep / have kept hens obsessively and discussed all their doings here.