A group of ground squirrels is foraging in a field for food. One of the individuals observes a predatory bird overhead and makes an alarm call as the bird approaches. The location of the individual that made the call is now known to the predator, which increases the caller's chance of being attacked, but it also allows other members of the group to escape. Later, in a similar situation, a different individual in the group makes the alarm call. This an example of: Spiteful behavior Selfish behavior Reciprocal altruism Eusociality.