Hairy-Legged Vampire Bat (Diphylla ecaudata) – A Species Profile

The hairy‑legged vampire bat (Diphylla ecaudata) belongs to the family Phyllostomidae, subfamily Desmodontinae, and is one of three true vampire bat species in the Neotropics. Its range extends from southern Mexico through Central America to northern Argentina, occupying lowland tropical forests, savannas, and riverine corridors where suitable roosts such as caves, hollow trees, and abandoned structures are available. Unlike its relatives, D. ecaudata possesses dense, hair‑covered hind limbs that aid in thermoregulation and stealth when landing on prey. The species is nocturnal, emerging at dusk to hunt mammals, primarily livestock and wild ungulates, by making a shallow incision with its razor‑sharp incisors and lapping blood with a specialized tongue. The IUCN classifies the bat as Least Concern due to its broad distribution, but localized declines have been recorded where habitat loss and pesticide use reduce prey availability. Conservation actions focus on protecting roost sites and promoting sustainable livestock management to mitigate conflict.

Hairy‑legged vampire bats form small, fluid colonies of 10‑30 individuals that roost together in tight clusters, facilitating thermoregulation and social grooming. They are highly social, using a repertoire of vocalizations, wing‑flapping displays, and scent marking to maintain group cohesion. Foraging occurs individually; each bat flies up to 15 km from its roost, employing echolocation calls centered around 30‑45 kHz to navigate dense forest understory. Territory is not defended aggressively; instead, overlapping foraging ranges allow multiple bats to exploit the same herd of cattle or deer. Communication within the colony includes contact calls that convey identity and location, while a unique “buzz” sound is emitted when a bat returns with a successful blood meal, prompting reciprocal feeding among roost‑mates through food‑sharing behavior known as regurgitative altruism.

Diphylla ecaudata is a strict sanguivore, feeding exclusively on the blood of mammals. Preferred hosts include cattle, horses, capybaras, and wild deer, with occasional opportunistic feeding on domestic dogs and humans in disturbed habitats. An adult bat consumes roughly 20‑30% of its body weight in blood per night, equivalent to 6‑9 ml, which provides the necessary protein, iron, and water. Feeding is performed by landing on the host’s skin, using its sharp incisors to create a 2‑3 mm incision, and then lapping the exuding blood with a tongue equipped with a specialized papillae array. The bat’s saliva contains anticoagulant compounds (e.g., desmoteplase) that prevent clotting for up to 30 minutes, ensuring a continuous flow. Energy intake is supplemented by occasional ingestion of fruit or insects when blood sources are scarce, but these items constitute less than 5% of the diet.

Females reach sexual maturity at 10‑12 months and typically breed once per year, with a peak in the rainy season (April‑June) when prey abundance is highest. Mating occurs in the roost, and females give birth to a single pup after a gestation period of 190‑210 days. Newborns weigh about 4‑5 g and are altricial, relying on maternal care for thermoregulation and nourishment. The mother nurses the pup with a milk rich in lipids for the first three weeks, after which the juvenile begins to practice blood‑feeding under the watchful eye of the mother. Pups are weaned at 8‑10 weeks and become fully independent by three months, at which point they join the colony’s foraging activities. Longevity in the wild is limited by predation and disease, but the species exhibits a relatively high juvenile survival rate of 55‑60% in protected roosts.

The IUCN lists the hairy‑legged vampire bat as Least Concern, estimating a global population of 500,000‑800,000 mature individuals. However, regional threats are mounting. Habitat fragmentation from agricultural expansion reduces roosting sites, while intensive livestock management and the use of insecticides diminish prey availability and can cause secondary poisoning. Human‑bat conflict arises when bats feed on livestock, leading to retaliatory killings and culling programs in some countries. Climate change may alter the distribution of suitable host species, potentially compressing foraging ranges. Conservation measures include protecting cave and tree roosts, promoting bat‑friendly livestock practices, and conducting public education campaigns to reduce persecution. Ongoing monitoring suggests a modest population decline of 5‑10% over the past decade, underscoring the need for proactive management.

• The species’ hind‑leg hair is so dense it creates a “furry” appearance, unique among vampire bats.
• Its saliva contains desmoteplase, a potent anticoagulant now studied for stroke treatment.
• Hairy‑legged vampire bats can fly up to 30 km in a single night while searching for hosts.
• Unlike other vampire bats, it often feeds on larger mammals such as cattle rather than small rodents.
• It practices reciprocal food‑sharing, where individuals regurgitate blood to feed roost‑mates that failed to feed.