These are interesting critters. Apparently they are so tiny that there is not enough room for a decent vestibular system, as a result they are awkward jumpers.
https://www.floridamuseum.ufl.edu/s...t-vertebrates-to-lose-the-ability-to-balance/
https://www.floridamuseum.ufl.edu/s...t-vertebrates-to-lose-the-ability-to-balance/