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the fish fans sand to unearth the bivalve, takes it into its mouth, swims several metres to a rock which it uses as an anvil by smashing the mollusc apart with sideward thrashes of the head.

In many areas, such as memory, their cognitive powers match or exceed those of ‘higher’ vertebrates including non-human primates." At the other extreme, the electrogenic elephantnose fish, an African freshwater fish, has one of the largest brain-to-body weight ratios of all known vertebrates (slightly higher than humans) and the highest brain-to-body oxygen consumption ratio of all known vertebrates (three times that for humans).Yet it can be sophisticated, and the fact that fish can make judicious repairs to their creation suggests intelligence.Construction methods in fishes can be divided into three categories: excavations, pile-ups, and gluing.Some of these mounds can be 3 m in diameter and 40 cm high.The mounds serve to impress females or to allow species recognition during courtship.

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