Medicine & TechnologyA study on primates show that female monkeys with female friends tend to live longer, but no survival benefits were found linked to heterosexual friendships. Read the article to know how this could be an evolutionary precursor to human rituals.
Bottlenose dolphins are one of the most intelligent animals. In a behavioral study, the friends they choose while they're young are kept until adulthood. From their behavior, there are basic lessons about building relationships and preparing for the future.