Smarty fish

Fish can remember things for months, according to researchers, who have dismissed the myth that the animals have a three-second memory. The view that fish lack the brain power to retain memories is "absolute rubbish," said Dr Kevin Warburton of Charles Sturt University's Institute for Land, Water and Society in Australia.
He made his conclusions after studying the behavior of Australian freshwater fish such as the silver perch, which can remember a predator for several months after only one encounter. "They can learn to avoid predators after being attacked once and they retain this memory for several months," he added.