I was awake at 3.30am, so I got up, made a cup of tea and took it back to bed with me. Around 4am, I heard one of my chooks making a noise. Grabbed my dressing gown, ran downstairs to the back porch, turned on the torch - nothing around the chooks; so, back to bed. The chook made a noise about every 10 minutes; but I must have fallen asleep between 4.30 and 5am. At 7am, I went to let the girls out, as usual they all came running - except for Sienna. She was in the nest box, breathing rapidly, couldn't stand up and offered no resistance when I picked her up. I put her in our "hospital" pet carrier with a little food and water and brought her into the house. She was falling asleep, not interested in water or food, still breathing rapidly and, frankly, I would have said she only had a couple of hours to live It is now 7hrs on. She's looking perkier, breathing back to normal, still not eating but has drunk something, albeit a little; ;hasn't stood up yet, but she is now moving her legs a little. So, not at deaths door as I feared, but still not 100%. I'm now thinking she may have been in shock (literally petrified!). Now, I didn't see anything around their home when I checked early hours - only heard a chook noise. If it was a predator of any kind it would have to have been an extremely small one!! All the other chooks are fine; just Sienna. Any thoughts/ideas?? I'm going to keep her indoors for the rest of the day and over night to monitor her and let the extra warmth do its healing job for her.