I am always confused by my feelings when I see things like this... On the one hand, I enjoy seeing the birds doing tricks and it just melts my heart when I hear a little budgie talk in its tinny squeaky little voice BUT, at the same time, my mind is screaming NO NO NO! Budgies should have other budgies and no animal should be exploited for money!
http://honesttopaws.com/parakeets-do-tricks/