Goldfish can be seen in both INFRARED and ULTRAVIOLET lights
A goldfish is the only animal that can be seen in both infrared and ultraviolet light. Goldfish are quite intelligent and will recognize the person who feeds them, research show that goldfish have a memory-span of at least three months and can distinguish between different shapes, colors and sounds. They will show they know you by swimming rapidly back and forth when you are near the tank or splashing.
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