Named after Saint Louis of Anjou, the bishop of Toulouse, the mission is the namesake of the city of San Luis Obispo and San Luis Obispo County.
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North American beaver (Castor canadensis) have been thought to be non-native to San Luis Obispo Creek but Bolton recorded in "Anza's California Expeditions" that in April 1774, Father Cavaller of Mission San Luis Obispo de Tolosa gave Juan Bautista de Anza "thirty-odd beaver skins" along with other local gifts including fine Indian baskets and "the skins of eight bears, the animals for which the region was renowned".