Once, a Japanese quail got out onto the barn floor. One of my bobwhite cages is about at ground level, so they could see each other. The bob fluffed up huge, and made his 'Get any closer or I'll kill you' look on his face and started trying to get at him through the wire.
Can't say I would reccomennd it!
(Had a bob get in the Japanese cage and killed two of them. Jus sayin.)