Dolphins form friendships through shared interests just like humans

Using behavioural, genetic and photographic data collected from 124 male dolphins during the winter months in Shark Bay over nine years [2007 to 2015], the team analysed a subset of 37 male dolphins, comprising 13 spongers and 24 non-spongers.
Male spongers spend more time associating with other male spongers than they do non-spongers, these bonds being based on similar foraging techniques and not relatedness or other factors.

https://www.bristol.ac.uk/news/2019/june/dolphin-friendship.html

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