YouTube video of Barry... she's not very well...
We think this chicken has sour crop. From its head movements you can tell it isn't comfortable. It has been put on a diet of probiotic yoghurt mixed with regular layers pellets and 5ml of apple cider vinegar in every 1 litre of water.
If you skip to about 1:30 and 3:15 you can see its unusual head movements. At around 3:50 it puts its head down as if to eat and it swallows back liquid that has come from its crop.
There is signs of blood around its tail feathers and although the others are laying it isn't.
Am I doing the right things? Has anyone else experienced these head movements before?