Vervet monkeys live in groups of related individuals. They have interesting calls that distinguish between ground predators (snakes), and aerial predators (hawks). As vervets are foraging, if one sees a snake on the ground it will give a specific call, alerting the predator to its location, and the members of the troop will jump up onto the nearest tree away from the predator. This is an example of:

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This behavior is an example of kin selection, as the vervet monkey is alerting its fellow group members (who are likely to be related individuals) to the presence of a predator. By doing so, it is increasing the survival chances of its own kin, which would benefit the individual's own fitness in terms of passing on its genes.

Vervet Monkeys Live in Groups of Related Individuals