I wonder how many cats have really swallowed a canary?

At least one.

My cat makes a symphony of sounds when I get home. My other cat, used to be found with his lips chattering all day long from the birds on the roof below my apartment. Together they may be able to make the sounds of a canary if they talked about it together, until now they haven't.I will get them on it tomorrow

Not me

My cat could do it I think, lol.

Thanks for best comment.

They will never tell!