In common with many other mobulid species, there is a dearth of information on the natural history of the smoothtail devil ray. Based on studies in the Gulf of California, Mexico, this devil ray appears to have a highly specialised diet, with euphasiid shrimp and, to a slightly lesser extent, mysid shrimp being the main prey items. It is not known to form large schools, a behaviour exhibited by some of its close relatives, but instead is usually observed solitarily or in small groups of two to six (1) (6).
In common with many elasmobranchs, mating, birthing and juvenile life predominately take place in shallow waters. It reproduces ovoviviparously, with each female producing just a single pup per litter, which develops within an egg inside the mother's body but emerges alive after hatching. The gestation period is around 12 months (1) (6).