We set up a 1m x 1m x 1m enclosure, using a Cube extension and some other bits. We put a feeder and drinker in, plus our second electric hen.
The chicks were nervous at first, but were soon running around, nibbling the grass, jumping on and off the hen.
They ate happily, drank happily, dozed happily.
If it's dry and hot tomorrow, we'll put them out for longer.