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The Quarren are a humanoid race native to Calamari's deep oceans. They have helmet-shaped heads that are composed of a mass of tentacles set below close-set eyes. They are more accustomed to deep-sea living, and chose to live below the water. Their conservative and solitary nature has led them to be unwilling to trust new ideas or lofty concepts.
When they first came in contact with the shore-dwelling Mon Calamari, the Quarren were hesitant. They eventually began to cooperate with the Mon Cal, and together they developed a symbiotic relationship in which the Quarren provide the raw materials, and the Mon Cal provide the knowledge and expertise; this led to the construction of the huge floating cities that dominate Calamari's oceans. Because of their pragmatic nature, the Quarren did not want to travel and explore the stars, as the Mon Cal did, and this began to create friction between the two races. When the Mon Cal's dream of contact with other stars became the deadly war with the Empire, the Quarren chose to ignore it, leaving the battle to the Mon Calamari who brought it upon themselves.
However, the Quarren could not escape the Empire, and it is rumoured that a Quarren helped the Empire evade the Calamarian defences and overtake the planet. Unfortunately, the Quarren were enslaved along with the Mon Cal. When the Mon Cal resisted Imperial rule, the Empire began destroying the floating cities. This served to unite the two races temporarily, and together they were able to solidify their defences and drive off the Empire with nothing more than crude weapons. After that, there were a number of Quarren who left the planet, seeking a life among the stars as their neighbours the Mon Cal did.