[2] It has been considered synonymous with Wagner's bonneted bat, Eumops glaucinus.

The mouth also is then opened widely and threateningly, and a sufficiently grim armature of teeth developed.[5]E.

ferox is very closely related to the Florida bonneted bat, Eumops floridanus.

[6] Authors of another paper hypothesized that E. ferox and E. floridanus were so closely related because their recent divergence caused incomplete lineage sorting.

[8] E. ferox is a nocturnal species, roosting in sheltered places during the day such as underneath roof shingles.

Most females give birth in late June, with lactation lasting 5–6 weeks.