BBC Nature, March 2012 (Photo: Whitney Friedman, SBDRA)
Male bottlenose dolphins organise gang-like alliances – guarding females against other groups and occasionally “changing sides”.
A team studying dolphins in Shark Bay, western Australia, say the animals roam hundreds of square kilometres, often encountering other dolphin groups.
https://www.bbc.co.uk/nature/17522450
https://www.bbc.co.uk/nature/17522450
Internet Archive: https://web.archive.org/web/20140201103139/https://www.bbc.co.uk/nature/17522450