The Nicobar flying fox, like most bats, is mostly active at night (2). Beginning to search for fruit after dusk, most Nicobar flying foxes forage between 8 and 11 pm, although some individuals continue feeding until as late as 4 am (5). The Nicobar flying fox generally prefers seasonally occurring fruits over fruits that grow all year round, and also favours a lot of fruits also eaten by Blyth’s flying fox (Pteropus melanotus) (5). Rather than challenge each other over the fruit, the two bat species instead forage in different areas and from trees of different heights, with the Nicobar flying fox foraging from trees 15 to 20 metres in height and Blyth’s flying fox preferring to forage at heights greater than 20 metres (5).
Due to its fruit diet, the Nicobar flying fox, like many fruit bats, plays a vital role in dispersing forest seeds (10).
The feeding sites of the Nicobar flying fox tend to be separate from the roost sites, where the bat rests during the day (5). Females appear to roost further away from their feeding sites than males (5). Unlike most flying foxes, which roost in large colonies (8), the Nicobar flying fox typically roosts alone in well camouflaged spots, 20 to 30 metres up in the forest canopy. The Nicobar flying fox only forms groups to feed and mate (1) (5).
Most flying foxes have a relatively low reproductive rate for mammals of their size, and give birth to only one pup at a time (8). The Nicobar flying fox is no exception, with females first giving birth aged between four and six years old (9). The Nicobar flying fox breeds during the rainy season, to coincide with the flowering of several of its preferred fruit trees (5).