Peacock spiders have fans or flaps on the abdomen that are made of brightly colored and iridescent scales and hairs. These spiders are mostly found in Australia. 

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Male peacock spiders are brightly colored with iridescent scales and hairs that are used to attract females for mating

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image of Spaeleoleptes gimli

A newly discovered species of spider is named after “Lord of the rings” dwarf Gimli