Imagine his surprise.
Finally, after sniffing the butts of rodents all round the world, the good doctor had found the fabled "Butt Butter". He allowed himself a smile as he pictured the faces of those smug bastards back at the Royal Society when he demonstrated his astonishing find. Then, he gloated, his dignity would be restored and their taunts would no longer invade his sleep.
"Doctor Nosy Ratbutt yourself!" he thought to himself as he packed his things and prepared the beaver's cage for the long journey home.