I read your article. But not only monkeys know each other by name, dogs and cats also distinguish names very well. Each of them responds to their own nicknames. This is clearly visible in a pack. Cats are especially interesting to watch, sometimes it seems to me that they are telepathic, because I often see this picture: two cats are sitting opposite each other, and do not look directly at each other, but it is clear that they are having a tense thought process, they can press their ears, can suddenly pounce on each other, or, on the contrary, peacefully disperse. As if one insulted the other, or, on the contrary, apologized.