Anyone ever seen a flea circus ...... ?

A crossword puzzle clue today ( performing insect ... answer 'flea' ) reminded me of a flea circus that I saw in the sixties. I think it was at Dreamland in Margate, Kent and I remember these fleas walking 'tightropes' and pulling little carts. Not the height of excitement agreed but we were a lot less demanding forty years ago! Has anyone ever seen such a sideshow ( as they were then called ), when and where was it and do these things exist today?