  urlLink Guardian Unlimited | Life | Why male dolphins like to roam : "Many mammals behave this way. Males roam to look for mates while females stay with their young. But marine mammals were thought to act differently, with both males and females loyal to their group. According to Möller, coastal bottlenose dolphins live in complex social groups like humans in ancient societies. Males form alliances, while the females form loose affiliations with shifting allegiances. " 
