A species of aquarium fish has a surprisingly long memory — it can recall the location of a tasty morsel of food up to 12 days after encountering it, according to a new study. "Fish that remember where food is located have an evolutionary advantage over those that do not," study co-author Trevor Hamilton, a neuroscientist at MacEwan University in Canada, said in a statement. But after talking with Erica Ingraham, a student at MacEwan University who owned aquarium fish, Hamilton wondered whether some fish species were smarter than usually thought. African cichlids (Labidochromis caeruleus), in particular, tend to show aggression, which would normally require longer-term memory to remember past grievances.
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