Flea circus

This article is about flea circuses in general. For the Tex Avery animated short, see The Flea Circus.
The flea circus of Maxfield Rubbish, San Diego, CA (2009)

A flea circus is a circus sideshow attraction in which fleas are attached (or appear to be attached) to miniature carts and other items, and encouraged to perform circus acts within a small housing.