These subterranean rodents spend their entire lives underground, rarely emerging into the sunlight.

Nature · Published 3 October 2026 Swipe more like this →

In short: Blesmols are highly specialized African rodents that have evolved to thrive in total darkness. With blunt heads, protruding incisors, and bodies built for excavation, they spend their lives carving elaborate tunnel networks. While some are solitary, others live in complex, eusocial colonies that mirror the structure of insect hives.

Blesmols, belonging to the family Bathyergidae, are a group of about a dozen species of burrowing rodents found in arid regions south of the Sahara. These animals are uniquely adapted to a subterranean existence, possessing cylindrical, stocky bodies, short limbs, and small eyes. Because they spend almost their entire lives underground, they have evolved to be highly sensitive to ground vibrations, compensating for their limited vision. Their incisor teeth protrude forward beyond the mouth, allowing them to chew through soil while keeping their mouths closed to prevent ingestion of dirt.

The social structures of blesmols vary significantly across the family. While species like the dune, cape, and silvery blesmols are solitary, others, such as the common mole rat and the naked mole rat, are colonial. The naked mole rat is particularly notable for its eusocial behavior, living in colonies of up to 300 individuals. Within these groups, a single dominant breeding female mates with a select few males, while the rest of the colony members remain nonbreeding or functionally sterile helpers. These colonies are highly productive, with the breeding female capable of producing up to five litters annually.

Evolutionary history traces the blesmol family back to the Early Miocene Epoch, between 23 million and 13.8 million years ago, in Africa. They are classified within the suborder Hystricognatha. While most blesmols are covered in dense, velvety fur, the naked mole rat is largely hairless, with wrinkled, pinkish skin. Their diet consists primarily of roots, bulbs, and tubers, which they often harvest by pulling plants down into their tunnels from below. By excavating these complex burrow systems, blesmols create a secure environment that protects them from surface predators, allowing them to thrive in harsh, dry grasslands and savannas.

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