00:00In several species of non-human primates, we find so-called language properties that
00:22are ultimately not human-like.
00:52The playback of the day was a series of cracks.
01:13The male, in particular, resumed the cry of alarm that signals a leopard, and these
01:20females reacted immediately.
01:27Monkeys use it to tell themselves that they have to be careful, but no need to hide.
01:41It's this cry that sounds a bit like that.
01:54Visually, it is represented in the form of an arch.
02:03But the fine structure of the arch, as we can see in these different examples, is under
02:13social influence.
02:14Two females who are friends will copy each other.
02:17On the right and on the left, we see different forms of arches of two females copying each
02:22other.
02:23They will avoid cutting each other's throats, they will respect a round of speech, and the
02:37priority is usually given to the elderly, who will vocalize first.
02:42These are rules that young people will have to learn.
02:45Young people, for example, will cut their throats 12 times more than adults, the time
02:51it takes to learn the right way to vocalize in society.
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