[1] A small population exists on the Pacific coast of the Baja California peninsula, between Isla Encantada and Punta Coyote.

[7] Since it lives on small islands, the range of M. vivesi is naturally fragmented, but data from microsatellites and the mtDNA control region indicate that there is no isolation by distance in the species.

[10] Myotis vivesi feeds chiefly on marine fish[11] or crustaceans,[7] including the squat lobster Pleuroncodes planipes.

[14] M. vivesi inhabits an arid environment and has evolved the ability to concentrate its urine; this allows it to survive by drinking seawater.

However M. vivesi that share roosts with these petrels swiftly react by biting and flapping when the lizards are detected, effectively warding the reptiles off.

[17] Ménégaux gave no indication of the etymology of the specific name vivesi; it may either refer to a person called Vives, or derive from the Latin verb vivere, "to live".

[7] The closest relatives of M. vivesi are other New World species of Myotis which are not adapted to piscivory, rather than the other piscivorous bats in the genus.