I actually do know that. Chickens are pretty domesticated, which makes them easier to train and they do learn fairly quickly as long as you treat them like chickens.
Quail are quail, and you have to expect them to act like quail. For their tiny size and prey status, they act as expected.
I went out to coop the chickens and found that they had cooped themselves and all I needed to do was shut the door. Chickens really are smarter than quail. Not that that takes much. Quail are dumb as rocks.
If they're eating chicken layer feed, they're definitely suffering from malnutrition, but the twisted neck has me worried. I strongly recommend getting one of the bodies tested. The twisted neck could be a sign of Virulent Newcastle's disease which is highly contagious and frequently lethal...
That looks necrotic to me. I'm guessing injury, quite likely something like you described. You're doing the right things, but don't be surprised if the black part dries up and falls off. Your bird will be okay without the toe.
I use cardboard boxes turned over and cut two holes in them. They also love the dollar store baskets. They feel hidden but can still see out of them. Again, cut two holes so they don't get trapped in case a bully chases them into one.
I would like to experience that. I don't know if I'd want to live in that, though.
The first time I visited the UK I remember it being 11PM and it was still light out in London.
Decorating their pen is something completely up to you. Quail don't really like change much, though, so it's best not to rearrange things too much at any given time.
You only need to clean branches and such if they get too much poop on them. I would hose them off, let them dry, then put them...
I lived for over 50 years over 500 miles south of where I am now. The shortest day is a little over half an hour shorter than I'm used to, and the longest day about half an hour longer.