Nutrioso's name is derived from the Spanish word Nutria ("Otter"). The early Spanish colonists referred to beaver as "nutria", perhaps because the Eurasian beaver had been extinct in Spain since the 17th century. On August 2, 1776 Francisco Silvestre Vélez de Escalante wrote in his diary, "...we halted in a small plain on the bank of another arroyo which is called Rio de las Nutrias, because, although it is of permanent and running water, apparently during all or most of the year it stands in pools where they say beavers breed." The first settlers in the area either killed an otter and a bear (Oso in Spanish) and took the name from that incident, killed a beaver and a bear and misused the term "Nutria" or killed just a beaver and used the term "Nutrioso" to mean "Of Beavers".
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