Quails - you cant keep more than 1 male together as they are very aggressive... but then for eggs you dont need a thingy anyway!
You have to give them plenty of head height - such as an aviary as they fly vertically and will kill themselves if they dont have enough height.
I think they are fairly easy to keep - lay from 9 weeks of age until 2 years i think!
But they get out really easy so you need a really secure aviary... they arent friendly like chickens so you cant tame them.
Hope that helps.