AT A GLANCE
- Common Name: Mauritian Tomb Bat
- Scientific Name: Taphozous mauritianus
- Category: Mammals
- Subcategory: Bats
- Range: Sub-Saharan Africa, Madagascar, Mauritius, Réunion, Seychelles, and surrounding islands
- Habitat Type: Open savannas, coastal palm groves, riparian woodlands, and urban parks, frequently roosting on vertical tree trunks, rocky cliffs, and outer building walls
- IUCN Red List Status: Least Concern
- Lifespan: 6 to 10 years
- Diet: Insectivorous (nocturnal moths, beetles, winged termites, flies, and cicadas taken in mid-air)
- Average Size/Weight: Wingspan 35 to 40 cm; forearm length 58 to 65 mm; weight 20 to 36 g
- Key Defining Feature: Striking grizzled salt-and-pepper grey dorsal fur contrasting with a pure snow-white belly, roosting out in the open on vertical tree trunks with watchful, bulging black eyes
Overview
The Mauritian Tomb Bat (Taphozous mauritianus) is one of the most distinctive and visually striking microbats of the African continent and western Indian Ocean islands. Belonging to the sheath-tailed bat family Emballonuridae, it defies the stereotypical nocturnal bat habit of concealing itself in deep, dark caves. Instead, this species boldly roosts out in the open on vertical tree trunks, sunlit rock faces, and exterior walls of buildings, where its salt-and-pepper grizzled pelt provides immaculate bark camouflage.
Biology and Physical Characteristics
Taphozous mauritianus has an exceptionally sleek, aerodynamic profile with narrow, elongated wings designed for rapid, agile flight in open airspace. The dorsal pelage is an intricate mosaic of frosted grey, sepia, and silver-white hairs that closely mimics lichens and weathered tree bark. In stark contrast, its throat, chest, and underside are pure, luminous snowy white. It has large, glossy black eyes that provide keen daytime vision, complementing a sophisticated high-frequency echolocation system. Unlike many cave bats, the tail does not end inside the tail membrane; rather, it perforates the dorsal surface of the interfemoral membrane, allowing the sheath to slide back and forth to adjust wing surface area during high-speed aerial acrobatics.
Behavior and Ecology
Rather than hanging upside down by both feet, Mauritian Tomb Bats typically cling vertically flat against tree trunks or masonry, head upward or tilted slightly, supported by their thumb claws and hind feet. Highly alert even during bright daylight, they shift position to remain in the shade and maintain constant vigilance against avian predators. At dusk, they launch into fast, swooping flight over rivers, lawns, and tree canopies, hunting flying insects using loud, narrowband echolocation pulses audible even to young human ears. They roost in small social groups of two to twenty individuals, often returning to identical roosting perches for successive generations.
Conservation and Human Impact
The Mauritian Tomb Bat is classified as Least Concern on the IUCN Red List, reflecting its vast geographic distribution, large population size, and remarkable adaptability to human-modified habitats. The species readily exploits artificial buildings for roosting sites and feeds heavily on night-flying agricultural and urban insect pests, providing beneficial pest-control services. No significant global threats currently affect the species, although the excessive use of broad-spectrum insecticides can reduce prey availability.
Interesting Factoid
Unlike most bats that sleep inverted in total darkness, the Mauritian Tomb Bat rests head-up in broad daylight on sunny tree trunks, relying on its mottled bark-patterned fur for camouflage while keeping its wide black eyes wide open to track approaching birds.