The Mon Calamari people are a humanoid, aquatic species with high-domed heads, webbed hands and large, goggle-like eyes. They hail from the oceans of Mon Cala, a planet they share with the Quarren. During the Clone Wars, differences between the two cultures were fanned by Separatist troublemakers to erupt in civil war.
During the Galactic Civil War, the Mon Calamari were said to be the soul of the Rebel Alliance. The Empire pressed these gentle, amphibious people into war by subjugating their watery world. In retaliation, the Mon Calamari became one of the key species of the Rebellion, supplying badly needed warships to the outnumbered Alliance fleet.