Are you man or mouse?

or

Are you a man or a mouse?

Is there an eqivalent saying in Turkish?

I just did a literal translation and was asked to explain what I meant! Can anyone help please?????

Thanks in advance

I´m not sure if there is an exact translation for that but you could say "korkak mısın?" which is "are you a coward?"

 Thanks angelof death. I used that one in the end but I was trying to add a little more humour to it. He definitely did not understand my reference to a mouse!!