I thought I had it sorted: monkeys have tails; apes don't. So, in Gibraltar I saw the Barbary Apes which are actually monkeys: Barbary Macaques ( Macaca sylvanus), but they don't have tails! The more I learn, the less I know. By the way, apart from all the metal and plastic stuff we accumulate around us, how different are we from them? They look like my ideal neighbours.