False Vampire Bat

What is false vampire bat?

The term “false vampire bat” refers to several species of bats from the Old World (family Megadermatidae) and the New World (family Phyllostomatidae). Contrary to their name, these bats do not feed on blood like true vampire bats; they are actually carnivorous, preying on small vertebrates such as mice, lizards, and other bats.¹

These bats are characterized by their large size, prominent nose leaves, and large, rounded ears. Notable species include:

• Australian false vampire (ghost bat): Macroderma gigas, which is the largest bat in the suborder Microchiroptera, reaching up to 14 cm in length.¹
• Tropical American false vampire: Vampyrum spectrum, the largest bat in the New World.¹
• African false vampire: Cardioderma cor, which primarily consumes large invertebrates.¹

False vampires typically roost in caves or hollow trees. While they were historically misidentified due to their appearance, they play a distinct role in their ecosystems as predators. Notably, the Australian false vampire is currently classified as an endangered species.¹

How do true vampire bats differ in their diet?

True vampire bats are unique among all bat species because they are the only ones that are obligate sanguivores, meaning their diet consists exclusively of blood.²

While false vampire bats are carnivorous predators that hunt small vertebrates like mice, lizards, and other bats, true vampire bats have evolved specialized behaviors to feed on the blood of larger animals. Their dietary habits are categorized by the species:²¹³

• Common vampire bat (Desmodus rotundus): Primarily feeds on the blood of livestock, such as cattle, pigs, and chickens.²
• White-winged and hairy-legged vampire bats: These species are generally restricted to forest environments, where they feed on the blood of birds and other forest-dwelling animals.²

To obtain this diet, true vampire bats use heat sensors to locate sleeping prey, make a small incision with razor-sharp teeth, and lap the blood using specialized tongue movements. Their saliva contains a potent anticoagulant that prevents the blood from clotting while they feed. Each individual requires approximately 15 milliliters of blood per night to survive.²³

What is the purpose of a bat’s nose leaf?

A bat’s nose leaf is a specialized facial structure made of skin and connective tissue that surrounds the nostrils and extends as a free flap or flaps on the muzzle. While the exact purpose of this feature is not known for certain, it is widely believed to play a role in echolocation.⁴⁵

Because many species that possess a nose leaf emit their orientation signals through the nose rather than the mouth, researchers hypothesize that the structure helps influence sound output. Specifically, the nose leaf may serve to channel or narrow the beam of the high-frequency pulses used for sonar, assisting the bat in navigating and locating prey. Additionally, some suggest the structure may have a delicate tactile function.⁶⁴⁷

The complexity and shape of the nose leaf vary significantly across different families, such as the Phyllostomidae (American leaf-nosed bats) and Hipposideridae (Old World leaf-nosed bats), reflecting the diversity of these animals.⁵⁸⁴

Why is the Australian ghost bat considered endangered?

The Australian ghost bat (Macroderma gigas), also known as the Australian giant false vampire bat, is classified as an endangered species.⁹¹

While the provided search results confirm its status as an endangered animal, they do not specify the particular environmental or human-related factors driving this decline. As a member of the family Megadermatidae, this species is the largest bat in the suborder Microchiroptera, reaching lengths of up to 14 cm. Unlike true vampire bats, it is a carnivorous predator that feeds on small vertebrates such as mice, lizards, and other bats.¹