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.
A major new study, published recently in Nature Ecology & Evolution, has linked the complexity of Cetacean culture and behavior to the size of their brains.
The study is first of its kind to create a large dataset of cetacean brain size and social behaviors. The team compiled information on 90 different species of dolphins, whales, and porpoises. It found overwhelming evidence that Cetaceans have sophisticated social and cooperative behavior traits, similar to many found in the human culture.
The study demonstrates that these societal and cultural characteristics are linked with brain size and brain expansion – also known as encephalization.
The long list of behavioral similarities includes many traits shared with humans and other primates such as:
- complex alliance relationships – working together for mutual benefit
- social transfer of hunting techniques – teaching how to hunt and using tools
- cooperative hunting
- complex vocalizations, including regional group dialects – 'talking' to each other
- vocal mimicry and 'signature whistles' unique to individuals – using 'name' recognition
- interspecific cooperation with humans and other species – working with different species
- alloparenting – looking after youngsters that aren't their own
- social play
Dr. Susanne Shultz, an evolutionary biologist at Manchester's School of Earth and Environmental Sciences, said: "As humans, our ability to socially interact and cultivate relationships has allowed us to colonize almost every ecosystem and environment on the planet. We know whales and dolphins also have exceptionally large and anatomically sophisticated brains and, therefore, have created a similar marine-based culture.
"That means the apparent co-evolution of brains, social structure, and behavioral richness of marine mammals provides a unique and striking parallel to the large brains and hyper-sociality of humans and other primates on land. 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.
"This research isn't just about looking at the intelligence of whales and dolphins, it also has important anthropological ramifications as well. In order to move toward a more general theory of human behavior, we need to understand what makes humans so different from other animals. And to do this, we need a control group. Compared to primates, cetaceans are a more "alien" control group," said Dr. Michael Muthukrishna, Assistant Professor of Economic Psychology at LSE.
Dr. Kieran Fox, a neuroscientist at Stanford University, added: "Cetaceans have many complex social behaviors that are similar to humans and other primates. They, however, have different brain structures from us, leading some researchers to argue that whales and dolphins could not achieve higher cognitive and social skills. I think our research shows that this is clearly not the case. Instead, a new question emerges: How can very diverse patterns of brain structure in very different species nonetheless give rise to highly similar cognitive and social behaviors?"
Source: The University of Manchester
'The social and cultural roots of whale and dolphin brains" – Kieran C. R. Fox, Michael Muthukrishna & Susanne Shultz – Nature Ecology & Evolution (2017). DOI: 10.1038/s41559-017-0336-y'
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