A lot of Novelty Guys didn't like them beacaue all you could get for them back then was a $1.00 bill. But I found that they were could on come in because then the folks weren't afraid to come up against the Novelty Joint during intermission.
The last circus I worked them on was Roberts Bros in 1995.
P.S. The bird's tail has to be curled in opposite directions to make it sing!