Researchers say big-brained guppies are expensive, evolutionarily speaking.
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Researchers from Uppsala University in Sweden say that bigger brains make animals smarter, but that increase in brain size and cognitive ability comes at a price, evolutionarily speaking. In the study, researchers artificially selected guppies, one of the most popular freshwater aquarium species in the world, for big and small brain sizes.
Their evidence suggests that bigger brains and increased cognitive ability are linked, a topic that has been at the center of a heated scientific debate in recent years. According Niclas Kolm of Uppsala University, the findings also represent some of the first satisfying evidence that big brains are expensive, evolutionarily speaking.