Fleas.... itchy little beggars, though they taste quite nice when I catch one during grooming. First there's the pleasure of knowing I have caught one in my teeth when nibbling my fur, then the next pleasure of swallowing it down.
Some human scientists even count them when they come out the other end - to get some idea of how many we have caught. Apparently about 50% of them escape.
They are cunning little insects. They know that we cannot catch them if they stay round our neck, particularly if we have a beautiful furry ruff there. So that is where they lurk.
Of course, like all clean cats I use my back legs to scratch there. And hope they fall off if I am vigorous enough. But it doesn't have the same satisfaction of catching one in my teeth and swallowing it.And occasionally you get a really intelligent flea that hides in the fur round my cheeks or on the top of my head between the ears. When I wash my face, using my front paw wetted with saliva, I haven't a hope of reaching it. I can scratch but it is difficult to reach them there.
PS. My human saw a flea circus at Bertram' Mills' Circus in the l950s. The fleas wore tutus and one of them pushed a tiny tiny wheel barrow. Mind you, these were human fleas - bigger than cat fleas. I wonder what they tasted like.