Acomys – African spiny mice

Spiny mice are small to medium-sized rodents, with a tail that is usually equally long or slightly shorter, though it is often fragile and can break off under stress. One of the most striking traits of the Acomys species is their coat: the fur has stiff guard hairs or bristles along the back, giving them a “spiny” texture (though these are not true spines like a porcupine). Their tails are scaly and nearly bare of hair, and are somewhat brittle—many spiny mice can autotomize (shed) part of the tail when threatened. They also have relatively large ears and eyes, suited for nocturnal or crepuscular activity in rugged, rocky, or dry habitats. Their bodies tend to be compact with strong limbs, allowing them to navigate rocky terrain with agility.

They are mostly found in arid, semi-arid, and rocky environments, such as savannas, deserts, rocky hillsides, and scrublands. They often live among rock crevices, boulders, or in stony ground, using narrow shelters for refuge. They are common across sub-Saharan Africa, parts of East Africa, Arabia, the Sinai Peninsula, and the Middle East.
Spiny mice are primarily nocturnal (though some species or populations may shift to daytime activity under certain ecological pressures). They are generally terrestrial, though they may climb over rocks or low shrubs. Their diet is omnivorous, with a strong leaning toward plant matter: seeds, fruits, leaves, shoots, and occasionally insects, snails, or other small invertebrates. Their flexibility in diet helps them persist in harsh, variable environments.

One of the most remarkable features of Acomys is its ability to regenerate tissue. Unlike most mammals, some spiny mice can heal skin wounds—such as ear punches—by fully restoring skin, hair follicles, sweat glands, and even cartilage, with minimal scarring. This regenerative capacity has made them a biomedical research subject, as scientists hope to understand how mammals might regenerate damaged tissues without scarring.