28 March 2012
Bottlenose dolphins: 'Gangs' run society, scientists say
By Victoria Gill
Science reporter, BBC Nature
Only humans and Shark Bay dolphins have multiple levels of social groups
Male bottlenose dolphins organise gang-like alliances - guarding females against other groups and occasionally "changing sides".
The fact that the dolphins travel in their troops and frequently encounter strangers reveals a great deal about their intelligence, because when one group meets another, the animals have to decide how to respond.
Shark Bay dolphins deal with this by organising themselves into three different types of alliances.
Full article: http://www.bbc.co.uk/nature/17522450