​It sounds fishy, but it’s true: Atlantic cod are the latest example of animals being found to have regional accents or dialects. Researchers at the University of Exeter say the distinctive mating calls the fish make with their swim bladders vary from one place to another: American cod make a staccato popping sound, while European cod produce more of a growl. This could affect their ability to reproduce, as migration caused by climate change brings together different groups of cod with different dialects. Earlier this year researchers at Cambridge University used machine-learning techniques to show that wolves in different parts of the world have different howls. Birds, snow monkeys, rock hyraxes and sperm whales are also known to have geographically specific calls. Killer whales have even been observed modifying their calls to match those of bottlenose dolphins, when kept in captivity with them. Evidence of the existence of culture in animals? Dolphinately.