A female flea may consume up to fifteen times her own body weight each day.

There are 1,830 different kinds of fleas known throughout the world.

Fleas are vectors of Bubonic Plague, an epidemic in Europe in the 14th Century that killed 25,000,000 people, one-third of the entire population of that continent.

The largest known species of flea is a very rare, associated with Mountain Beavers, and it is 1/3 of an inch long.

The "Flea Circus" is real. There actually are people who will hitch living fleas to tiny carriages with gilded wires, and in the flea's struggle to escape it causes them to appear to dance, jiggle, or otherwise move things around.

In Mexico you might find "pulgas vestidas", or "dressed fleas" for sale. Fleas are dressed in tiny costumes and posed holding tiny loaves of bread, tools, or whatever.