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Social animals have to take into consideration the behaviour of conspecificswhen making decisions to go by their daily lives. These decisions affect theirfitness and there is therefore an evolutionary pressure to try making the rightchoices. In many instances individuals will make their own choices and thebehaviour of the group will be a democratic integration of all decisions.However, in some instances it can be advantageous to follow the choice of a fewindividuals in the group if they have more information regarding the situationthat has arisen. Here I provide early evidence that decisions about shifts inactivity states in a population of bottlenose dolphin follow such a decisionmaking process. This unshared consensus is mediated by a non-vocal signal whichcan be communicated globally within the dolphin school. These signals areemitted by individuals that tend to have more information about the behaviourof potential competitors because of their position in the social network. Ihypothesise that this decision making process emerged from the social structureof the population and the need to maintain mixed-sex schools.

Evidence for social role in a dolphin social network