In Sop Cop and Cat Ba, Vietnam, broad-eared animals have been recorded at caves. They used echolocation calls with multiple harmonic components.
The adult male and adult female examined in Vietnam had broad ears, each with an ear height of 16.4 mm.
The study reports cave roosts and records in karst landscapes, including secondary forest, scrub, and streamside settings.
The Son La male produced multiharmonic ultrasonic calls while emerging from a cave and flying in a flight tent. Near walls or obstacles, it produced shorter single calls or call groups.
In the Vietnam study animals, forearm length was 40.2 mm in the male and 39.7 mm in the female, and body mass was 8.9 g and 8.2 g respectively.
An extinction-risk assessment has not been added yet.