Doodle of wild imps vs Jesper's size
I tried doodling out a crappy little idea of the height difference for wild imps versus domestic, like Jesper. I don't seem to be in the right headspace for art today, so wild imps would be thinner, but my lil doodle anatomy is tubby, so just use your imagination a little.
They're not much smaller, but it would take a few to lift Jesper into the air.