The Yuma Myotis (Myotis yumanensis) is a species of vesper bat in the Vespertilionidae family. Yuma Myotis occur in a variety of western lowland habitats where it forages for insects just above the surface of slow moving water. It eats a variety of soft-bodied insects, primarily moths. It is found in Canada, Mexico, and the United States.It averages 78 mm long and weights 4-8 grams, and is similar to Myotis occultus.