Just to add to my previous comments. at about 2 1/2 weeks old, I still find the Coturnix to be very mild-mannered, calm, and actually, the seem kind of lazy. They spend a lot of time just laying around, all sprawled out like puppies. It's rather cute, actually. I guess when they don't have to work very hard for a living, they have leisure time.
I am trying to think of ways to stimulate them a bit more -- giving them seed heads of various grasses to peck at, leafy greens, insects, that sort of thing, but frankly, they aren't all that interested at this stage in anything except the mealworms. We'll see if they get more lively as time goes on.