Either there is a finite list of calls, so vervet monkeys, for instance, have a small list of calls to convey different warnings like " attack from a snake" or " attack from a leopard" .

要么是有限的叫声列表，例如黑长尾猴， 有一小部分叫声来传达不同的警告， 例如“来自蛇的攻击” 或“来自豹子的攻击” 。