This little chicken is smaller than the rest and has been gimping around. The bigger chicks probably bulldozed this little one.
I couldn't find anything obviously wrong with its leg, but it was curling it's toes into a fist so I tried a chick boot yesterday. It improved the toe curling overnight
Spoiled chicken is separated from the others to ensure plenty of feed and water. It does eat, drink and get around ok even though it doesn't use that left leg 100% yet.