Two papers provide new insights into bottlenose dolphins’ complex social system.
Researchers had previously shown the male dolphins of Shark Bay begin to form partnerships when they’re about 3 years old, after leaving their mothers. They soon join what scientists term a “first-order alliance” with a few nonkin pals. The small alliances cooperate in larger second-order alliances comprised of as many as 14 dolphins; they fight other alliances over females. These alliances can endure for decades, and often band together in even larger third-order alliances to battle rivals.
Comparing genetic data collected from biopsy samples from these males with those from 256 calves born since 1994, the scientists determined that
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