A couple of days ago, we noticed that one of our chickens was laying on the ground of the run, and wasn't getting up. We've set up a 'bed' for it in the wheelbarrow with some blankets, given it food and water, but it seems to have completely lost the use of its legs. Other than that it seems perfectly normal, alert, and drinking water whenever its offered (although she is not eating much). It actually seems thirsty (which is unusual, since any of our other sick chickens refused to drink water unless forced). Another thing is that it doesn't seem to be able to see all that well, as it was missing the food bowl and only drinks water when guided to it. Any advice would be appreciated, thanks!