This bat was studied in lowland rice fields in Guinea-Bissau. In a comparison with two related species, it was the smallest and used small, soft-bodied prey.
Among the three species compared in the study, it was reported as the smallest and most manoeuvrable.
A DNA-based diet study found that A. nanus used small, soft-bodied prey. The study as a whole identified insects from more than 13 orders.
An extinction-risk assessment has not been added yet.