Indeed they are!
Some people have kept mixed species of Quail together with
some success but personally I find it way to risky and wouldn't.
I raised Quail along with my silkies from hatching but as the Silkies get about 3 times the size of the Quails it's time to separate them. They may not mean it 'intentionally' but one peck from the Silkie could kill the quail. When they're chicks though they get on fine.
Hugo my pet Quail loves belly tickles though and he gets super excited on a morning when I go to see him