Megabats, especially those living on islands, have few native predators: species like the small flying fox (Pteropus hypomelanus) have no known natural predators.
Non-native predators of flying foxes include domestic cats and rats.
The mangrove monitor, which is a native predator for some megabat species but an introduced predator for others, opportunistically preys on megabats, as it is a capable tree climber.
Another species, the brown tree snake, can seriously impact megabat populations; as a non-native predator in Guam, the snake consumes so many offspring that it reduced the recruitment of the population of the Mariana fruit bat (Pteropus mariannus) to essentially zero.
The island is now considered a sink for the Mariana fruit bat, as its population there relies on bats immigrating from the nearby island of Rota to bolster it rather than successful reproduction.
Predators that are naturally sympatric with megabats include reptiles such as crocodilians, snakes, and large lizards, as well as birds like falcons, hawks, and owls.
The saltwater crocodile is a known predator of megabats, based on analysis of crocodile stomach contents in northern Australia.
During extreme heat events, megabats like the little red flying fox (Pteropus scapulatus) must cool off and rehydrate by drinking from waterways, making them susceptible to opportunistic depredation by freshwater crocodiles.

Megabats are the hosts of several parasite taxa.
Known parasites include Nycteribiidae and Streblidae species ("bat flies"), as well as mites of the genus Demodex.
Blood parasites of the family Haemoproteidae and intestinal nematodes of Toxocaridae also affect megabat species.
Megabats, especially those living on islands, have few native predators: species like the small flying fox (Pteropus hypomelanus) have no known natural predators. Non-native predators of flying foxes include domestic cats and rats. The mangrove monitor, which is a native predator for some megabat species but an introduced predator for others, opportunistically preys on megabats, as it is a capable tree climber. Another species, the brown tree snake, can seriously impact megabat populations; as a non-native predator in Guam, the snake consumes so many offspring that it reduced the recruitment of the population of the Mariana fruit bat (Pteropus mariannus) to essentially zero. The island is now considered a sink for the Mariana fruit bat, as its population there relies on bats immigrating from the nearby island of Rota to bolster it rather than successful reproduction. Predators that are naturally sympatric with megabats include reptiles such as crocodilians, snakes, and large lizards, as well as birds like falcons, hawks, and owls. The saltwater crocodile is a known predator of megabats, based on analysis of crocodile stomach contents in northern Australia. During extreme heat events, megabats like the little red flying fox (Pteropus scapulatus) must cool off and rehydrate by drinking from waterways, making them susceptible to opportunistic depredation by freshwater crocodiles.
Megabats are the hosts of several parasite taxa. Known parasites include Nycteribiidae and Streblidae species ("bat flies"), as well as mites of the genus Demodex. Blood parasites of the family Haemoproteidae and intestinal nematodes of Toxocaridae also affect megabat species.
Megabat