Which of these can leap a distance of some 50 times their body length?

Ever seen a “Flea Circus”?

I would believe they jump much, much more than 50 times their size (3mm x 50 is only 15 cm)

Player Cosmo Chic, yes! I despise fleas... but they l9ve me. I'm the early warning system for their presence.

Fleas jump backwards top