They are insectivores and use echolocation calls through the mouth to track their prey, which includes flies, beetles, butterflies and moths.

[3][4] The long nose and upper lip are highly mobile and can shift upward to enlarge the mouth opening.

During daily grooming, males will fill these sacs with drops of urine and glandular secretions.

For example, a female pup will give the male trill of courting followed by echolocation clicks then adult territorial challenges.

These mixed-up vocalizations have been equated with human infant babbling and mispronounced songs of young birds.