Faced with a group of macaques, how to identify each one?
In human society, unless there are very distinctive characteristics, Westerners are face blind to Easterners, and Orientals are also face blind to Westerners, and the two sides cannot easily distinguish the individuals in the other.
The Korean draft is a nightmare for Westerners
This is true in the face of the same kind, let alone a group of macaques of different species, and it is difficult for humans to distinguish their individuals more accurately without special markers.
One of the most important ways to distinguish is to study the personality differences of monkeys, such as activity, movement, behavioral habits, etc., and identify these differences.
However, when the monkeys are old and weak, their activity decreases significantly, their movements and behavioral habits will slowly converge and become very similar, and it will become very difficult to identify them.
Old monkey
Old monkeys all look alike, the movements are very close, and there will always be old monkeys in the wild monkey group, so it gives people the feeling of being the same old monkey or the same old monkeys, further forming the wrong impression of "old monkeys do not die".
In fact, what you see at different times is just different old monkeys.
There are similar misunderstandings with swallows.
It is often said that "the swallow returns to find the old stronghold".
Swallow brooding
After the labeling study of swallows, the swallows that come back every year are not the same batch, let alone the same. It's also just because they look so similar that they can't be distinguished without special markings.
That's the truth.