[5] The Mexican big-eared bat endemic to Mexico and known between Sonora and Coahuila in the north and Michoacan Yucatán in the south;[1][2] it is rare in the southern end of its range and uncommon elsewhere.

[4] Being a nocturnal species, they rest during the day; their day-time roosts are in open caves[4] and mine shafts.

[7] Studies of the males of the species show they have one long reproductive cycle per year.

The timing of their cycle is dependent on both physiological (body condition, neurological, and endocrine signals) and environmental (temperature and resource availability) factors.

[1] The major threat to the species is humans, disturbing their roosts and causing habitat loss.