Dolphin by Tim Nicholson

Whales and dolphins (Cetaceans) live in tightly-knit social groups, have complex relationships, talk to each other and even have regional dialects – much like human societies, according to researchers from Manchester Uheniversity.

The study has linked the complexity of Cetacean culture and behaviour to the size of their brains.

The research is first of its kind to create a large dataset of cetacean brain size and social behaviours. The team compiled information on 90 different species of dolphins, whales and porpoises. It found overwhelming evidence that Cetaceans have sophisticated social and cooperative behaviour traits, similar to many found in human culture. The study demonstrates that these characteristics are linked with brain size and brain expansion – also known as encephalisation.

The long list of behavioural similarities includes:

  • talking to each other
  • using names
  • looking after youngsters that aren’t their own
  • social play
  • teaching how to hunt and using tools
  • working together for mutual benefit
  • cooperative hunting
  • working with different species

Dolphins
Dr Susanne Shultz, an evolutionary biologist in Manchester’s School of Earth and Environmental Sciences, said:

Unfortunately, they won’t ever mimic our great metropolises and technologies because they didn’t evolve opposable thumbs.

The team used the dataset to test the social brain hypothesis (SBH) and cultural brain hypothesis (CBH). The SBH and CBH are evolutionary theories originally developed to explain large brains in primates and land mammals.

They argue that large brains are an evolutionary response to complex and information-rich social environments. However, this is the first time these hypotheses have been applied to ‘intelligent’ marine mammals on such a large scale.

Further Reading

The social and cultural roots of whale and dolphin brains, Nature Ecology & Evolution (2017). DOI: 10.1038/s41559-017-0336-y

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