I believe they are Coturnix quail. I acquired 3 males and 3 females by chance as I agreed to feed and water them for a week, but their owner was then locked down in Germany due to Coronavirus. I then brought them home knowing absolutely nothing about poultry! I got four extra females and have tried to integrate. But I ended up taking away the old girls as they were looking worn. One of the original six, a speckled black beauty, I thought was a female, but it has never laid an egg, no foam either, and I have never seen it mating with any females: It has also been attacked quite severely firstly by a male, and a couple of months later by a female, maybe it's a hermaphrodite or barren? I keep it with one female now. One day I will get a smart phone and post his/her picture! Many thanks for all your advice.